The poster who mentioned that what we call 'beer pong' is actually 'beirut' is correct... Beer pong involves actually playing ping pong.
its the one where you have like 3 quarters to start w/ and you sit in a circle and everyone gets one card and you can either keep it or pass it to your left and they have to switch with you unless the have a King, which is a blocker. The person w/ the highest card wins all the quarters in the middle (you only put one in per round)
PS after my 10th grade homecoming we played the literal "beer pong" like actual ping pong w/ straight bacardi in the cups lol