Ol' blue dipper
When you slip a urinal cake inside of your boss' coffee mug while they aren't looking.
guy #1: "Hey man, I just gave my boss the Ol' blue dipper while he wasn't looking."
guy #2: "Did you steep it in his coffee like tea?"
Boss: "Agh! what's in my coffee!??"
guy #1: There it is!
guy #2: "Did you steep it in his coffee like tea?"
Boss: "Agh! what's in my coffee!??"
guy #1: There it is!