Traditionally it's a favorite holiday of the boys, but Richard has chosen to spend most of this Stop Day evening enjoying some sophisticated musical theatre (about witches). He vows to return to Larryville in plenty of time to "hit the town and bang a sorostitute."
Left to his own devices, will Kip end up in a private room at Abe and Jake's? Five bucks says he goes to Quinton's instead.
Kip's Urban Dictionary defines "sorostitute" as follows: "A sorority girl who has sex for Jaeger shots."