A variation of beer bong usage involving hard alcohol. When the subject is halfway through funneling a beer a shot of Bacardi 151 rum is added, giving the recipient a "slap" in the face. First usage of the term can be traced to Kappa Alpha Lehigh around 2004.
"Shit bra, Jimmy took that Kap Slap like a champ!"
by anonymous928347 March 14, 2010