grabbin another slice of pie

To cheat on your girlfriend and have sex with another woman.

John: Yo, Jimmy's legit and grabbed another slice of pie at the party last night.

Fabio: Fuck ya. Grabbin another slice of pie is the shit.

huge slice of pie

Adjective

To be a big deal; very important, or popular

“Hey dad have you ever heard of the singer Elton John?” “Yeah he was a huge slice of pie back in my day.”