Its arse.
A toothbrush.
Your sister's hymen.
He was looking for Pooh. - *My little brother told me this one hit me with a little bit of nostalgia.*
Here! (Must be said like you are holding a hit in)
The doctor said, surprised. "I don't know, it started with a boil on my arse." the frog said.
A pain in the arse.
It's rear end!