I'm not sure this is the pee pee song you were looking for but here ya go:
Pee peehave you ever heard a song about pee pee?
It's a little bit of rain coming out of you
It's a tinkle it's a puddle it's a wee wee too
Wee wee in French means yes yes yes
No no in French means no
Red is stop and green is go and sometimes pee pee is yellow