Smacking sillies
Doing the deed, getting busy, hitting the nasty, getting jiggy, having sex, fucking.
Jenny and Me were smacking sillies like hyenas on crack last night.
smacked silly
Being very high after smoking a large amount of marijuana
Shawn: I was smacked silly last night cuz, I couldn't even get off the couch
Justin: I know, I was there
Justin: I know, I was there