Peninnie 

Inverting your penis to become a vagina.

A transgender has a peninnie.

Peninnie by djtan23 August 9, 2017

Peninni 

When a man is so fat he has an inverted penis... You have to push around it to make it pop out.

Pronounced puh ninn ee

I thought he might be a transvestie until I realized he just had a serious peninni!!!

Peninni by CFDKP December 7, 2012