Yee yee in your wee wee

The word "yee yee" definition is a word of happiness used by sports enthusiasts.

Hunter: let's head out, yee yee!!

Wee wee is "the thing that peepee comes out of"

So "yee yee in your wee wee" means you have an awesome weewee.

A hot guy enters the room: Yee yee in your wee wee!