Maybe its just a self expression towards the profit they gain and call it as jackpot since gaining is means a win for them. Usually this is common word used by gambler so I assume that he is a gambler that's why he use those word on his statement.

But in bitcoin thing its really hard to spot a jackpot gains if we mean x1000 gain since gradual increase of price is usually happening with those coin. These kind of scenario happened on some shitcoins which we see pump and dump schemes is so common happening here. And people should avoid it if they don't want to experience painful defeat and maybe more better for to just go with bitcoin since provably that they will never get disappointed with this coin if they aim for long term.