Not to be confused with a sexual act, to wapoo means to party or dance.
Referenced in the 2008 movie, Mamma Mia, in a cheer by Donna and the Dynamos: "Dynamos! Dynamites! Sleep all day and wapoo all night!"
"What do you mean you're wapooing? I thought only sluts did that!"
"No, it means I'm going out to party tonight! I'm a virgin, genius!"