Button penis 

A man's penis under 3 inches in length. (See also: Micropenis)

Guy 1- Did you saw the coach in the showers?

Guy 2- Oh shit yeah, he has a button penis!

Button penis by Nobli June 1, 2015

Belly button penis

When a man has a penis that sticks out no further than his belly button

I asked him if that was his belly button or his penis and he said it was his belly button penis

Belly button penis by Sumfukinguy June 18, 2023

Penis button 

A disturbingly unattractive protruding bellybutton, particularly on an otherwise attractive female, so pronounced as to be reminiscent of a small penis. First appeared on paparazzi websites describing bikini pictures of talk show host Kelly Ripa's unnaturally protruding navel.

Bob: Hey look at that sweet honey strollin' up the beach.
Jay: Yeah, she's -WTF? What the hell is that stickin' outa her gut?
Bob: Oh man, she has a penis button! I'm gonna yyargh!!
Jay: Man, way to spoil the picture...Shit!
Sweet Honey: Hi guys!
Bob: (wwrrreettcchh!)

Penis button by Grafikman May 14, 2009

Benjamin Buttons Penis 

When your penis is large and very impressive at a flaccid state but when you gain an erection it shrinks to a very small babby carrot.

I have to give that chick the soft serve because I have a benjamin buttons penis

Benjamin Buttons Penis by TeaBaggins01 May 23, 2016