that's a bet Share definition Flag A slag term in Southern Ebonics meaning "we have a deal" or as an expression of agreement. Kid: Call me back tomorrow and I'll get 2 grams of that real good off ya.Dealer: Aight. That's a bet. that's a bet by sirdelv July 18, 2010 0 0 Get merch Get the that's a bet mug. Buy Now — $32.95 See more merch