Anti-peen 

A penis so small it stretches negatively through your asshole all the way from here to mars. The existence of an Anti-peen would bring down the average penis size to about 4 mm, as it would measure about -472 billion mm.

Guy: I wish the average penis size was 4mm

The Monkeys Paw subreddit: Granted, you now have an Anti-peen

Anti-peen by Gryan77802 November 6, 2019

Antipeen 

A penis so small, its actually stretching backwards through your ass all the way from here to Mars.
The existence of an antipeen would bring down the avegare penis size to about 4mm, as it would measure about -472 billion mm.

Guy 1: I wish the average penis size is 4mm.
TheMonkeysPaw: Granted, you now have an Antipeen.
Guy 2: That sucks, dude.

Antipeen by Maxence05_ November 6, 2019

Antipeen 

A penis so small it goes in to the minuses and subsequently creates a void of scarce for the length of it. For example a dick size of -5cm would qualify for an antipeen.

"That guys dick is so small that it qualifies as an antipeen. Can't you see the bulge in his ass cheeks?"

Antipeen by Weeweeboi420 November 6, 2019

Antipeen 

Definition of u/NishPa 's genital witch size is around -472 billion mm.

>Yup, that's a vagina
>>It's more an antipeen stretching through your ass all the way from here to Mars

Antipeen by Beraldino November 6, 2019