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 down
3. 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
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