The Poppins is the pal that agrees to get the least trashed on any given college night (to prevent others from serious injury/arrest, to have various Poppins rights). The role tends to become more desirable as the night goes on. Confusion over who IS the real Poppins may ensue. Name tags can help solve this issue, as can the consolation of another beer.
"I'M THE POPPINSSSSS...freakin'...Poppins..."
"Dude, you are not the damn Poppins."