Weak penis 

A person that is so pathetic and is of no use.

Man, that person is such a weak penis.

Weak penis by Yodasbitch1234 May 5, 2020

your penis is weak 

when a guy dosent have enough skill to get a girl in bed

Come on Davis your penis is weak

your penis is weak by Joe Szathmary December 3, 2007

weakpenis

adj (WEAKpenis)- used to describe something extremely displeasing or unsatisfying when words such as weak or sucky do not provide an adequate description of just how far below expectations a particular situation is.

Person #1: "Duuuude! The concert is sold out!
Person #2: "That's weakpenis!"

weakpenis by publius bloatalus July 15, 2011