After being fucked out of the Gucci flip flops that you threw on to fuck another man's bitch and as a result of the tremendous ass throwing skills of said bitch, its the act of enthusiastically striking either of the thot's buttocks with the intention of both congratulating her efforts and leaving the word Gucci emblazoned on her cheeks.
Darnell: Bruh I was fucking my uncles wife from the back. She was feeling it, she started yelling "DO IT! DO IT!" So I let them shits go.
Bruh: Oh shit son, you gonna get her pregnant again.
Darnell: Yeah probably. She was mad as shit, she didn't want the cream filling, she just wanted a gucci slap.
Bruh: So what you do?
Darnell: I gucci slapped that bitch. She earned it.