A very insulting term used to piss someone off. This doesn't neccesarily mean your mom has a penis, but the thought of it, would piss someone off. It's a good way to get someone to shut the fuck up when they talk a lot or when they ask a stupid question.

*Guy 1: Yeah, so can you believe that Julie is telling all her friend's I still like her?..the nerve of that bitch....

Guy 2: Yeah, well I heard your Mom's penis is the talk of the town.

*Guy 1: "Hey, I wanna drink tonight, so maybe you can drive".

Guy 2: "Maybe your Mom's penis can".

A casual invitation / threat used by an individual that is not afraid of fucking someone up.

An insult your mom has a penis therefore your mom is gay with your dads penis.

1 Your moms penis is a sexy kinky litle term for sex and fun
2 A ,,insolt,, but its more of a joke or someting you will find on 4chan by internet weebs
3 Its a great joke/prank if people dont expect it
4 Good combos with dezz nuts or your mama jokes.