Earlier in the day this person posted on Bsky that she was going to burn an aromatherapy candle for Riley Greene and that if he busted out of his slump it would be a slump buster. The person happened to be a trans girl combined with the notion known of so long in the male locker room of a "slump buster" (i.e., girl, possibly ugly or below your standards, you sleep with to get out of a "slump").
The implication is that he did bust out of his slump, and to explain the joke for you guys even further the humor i saw in this was that - correlation does not equal causality but it is funny to imply it does - she was offering to be his slump buster.