There are three real definitions of a penisbutt
1.
the view of a penis from underneath where u can see the line separating each ball which results in a butt-like structure. hence the name penisbutt
2. a penis on
upside down3. some who acts like they walk around with a penis
up there butt
1. Man, i was looking at my boyfriends penisbutt last night it was so
hawt!
2.
I heard that guy was born with a penisbutt.
3.
Omfg that bitch is such a penisbutt