Bet: Bet is a way of saying yes  or OK  or it's on.  Vibing: Gen Z is big on vibes. Vibing describes a generic positive feeling that someone has about something. Stan: This word is synonymous with supporting something. Sus: Short-hand for suspicious.

A slang expression that's used to affirm a statement or confirm an agreement. So when somebody says bet, really, what they're saying is okay, understood, or alright, i agree with that, or alright, i confirm that.