You can call it whatever you like, but I am not going to call buying on dip lump sum since in my mind those are different categories, even though I can see how people might convolute them merely because they are choosing to buy extra on the dips that are higher than their regular DCA.. but I still think that fails to recognize and appreciate the concept of the lump sum that buys right now.
I already gave the example in my earlier post of a guy who had suddenly received $6k, and I think that I explained that sufficiently well, but let me mix it up a little bit.
Let's say that the person is absolutely brand new to bitcoin, and he knows that he can invest $100 per week for the next 6 months from his salary (his discretionary income / his cashflow), and so that would be $2,600 that he is already planning to invest into bitcoin. And so then he has $6k also that he can move from some other investment or maybe it is an extra amount that was in his cash reserves.., so with that $6k and the $2,600, that means that he has a total of $8,600 that he could invest over the next 6 months. He can divide it however he likes, except $2,600 is currently not available because that is going to be flowing to him in the next 6 months at a rate of $100 per week. So he could lump sum invest anywhere between $0 and $6k, but then if he puts the whole $6k into the investment, then he has no money for buying on dips - except for the $100 per week that he expects to come in for the next 6 months, and that is a choice that he could change if he thinks that it would be good to set a bit aside for possibly buying on dips.. beyond the mere $100 per week that he has.
He could invest $4k right away and then just save $2k for buying on dips.. and instead of having 1 or 2 buys at some various price points, he could instead have 20 buy orders of $100 each all the way down to $40k.. and maybe they are $1,200 apart with the first one being at $63k and the next one at $61.8k and the next one at $60.6k and then next one at $59.4k etc etc etc... or he could have 4 buy orders of $500 each at various points on the way down.. so then he runs the risk that the buy on dip orders will not fill... so there is no guarantee that any of them will fill and that is the trade off that he has to make when he chooses the difference between how much he is going to buy right now with his lump sum amount or how much he is going to allocate for buying on the dips versus DCA.. and maybe he just wants to add to his DCAs and so that is another way of dealing with the extra money that he has available and either of those cases in which he holds back lump sum buying right now, are preparing him for down but they do not prepare him as much for up, and those are trade offs that guys have to consider and decide, since more down might not happen from here... but then if down does happen, does the guy want to have more funds than his DCA amount or is he o.k. with taking his chances and just lump summing all or most of the amount that he has available right at or around current prices. and there is no exact correct answer except that the guy should consider each of the three categories when it comes to funds that he has available to him..
Even with the regular cash coming in, the guy does not have to DCA right away with it, he can hold back some or all of it for buying on dips, or maybe having options to later lump sum the saved up amount if dips may or may not end up coming.
From your explanation I've begin to grasp the meaning of lump sum quite well and how I can use it, from your explanation a guy has a weekly investment of 100$ per week for the next six months of his salary which is about 2600$ and then an extra income that or amount that he could also use to invest about 6k as you said, if the person wanted to lump sum, he would be investing or buying immediately with that amount irrespective of the market condition, I've also seen from some of your older Comment when someone that maybe is just starting out his investment and feels that he is too far away or starting late might just want to start with a little bit of aggression by front loading his investment with a lump sum buy and then continue his normal weekly DCA.
Example let's say I want to start investing right now in bitcoin and I have a monthly income of 1000$(it's assumption figures) and I decide that I want to invest about 300$ from that amount into a weekly DCA investment which should be about 75$ weekly invested in bitcoin and then I also had some cash from my savings that I also wanted to use to invest in bitcoin maybe to give myself some kind of head start and the money was about 3000$ and I decide to use 1500$ to invest right away, that is what a lump sum buying would mean.
as there might not be such chances again 
