A (male) gay sexual term meaning to place an erect penis around a partner's anus and getting a dab of fecal matter on the tip then knocking one testicle with the fecal dabbed penis into the other testicle as one would with a chalked pool stick in a game of billiards.
Marty: Hey Steve, did you have a good game of billiards last night?
Steve: Yeah, I really had fun chalking the pool stick and knocking Richard's balls around.
Marty: That's what I call a good game of slop!
Steve: Yeah, I really had fun chalking the pool stick and knocking Richard's balls around.
Marty: That's what I call a good game of slop!
by FloppyHeadedNerfHerder1 January 11, 2014