It's a VERY disgracing slang-term. It's usually only males that say it But shemales can also say it. People in da hood say it all the time.
August: Did u hear about mina?
Thorbjørn: Mina who?
Augus: Mine balls in your mouth
Thorbjørn: 'crying'
When ur about to poopy but friend head under butt. poopy head
Oh im about to poopy
Friend: stick head under butt
Now he's a poopy head