Ninja Dick

When somebody as an above average or otherwise huge penis when erect but shrinks to near disappearance when flaccid, or in other words vanishes like a ninja.

Example: That mother fucker has a ninja dick.
Example 2: I got ninja dick. that shit maybe 1 or 2 inches long till I get a hard on but then that shit massive.

by Pickle Reeves May 3, 2023

Ninja dick

When a guy sends a pic or video of his penis without warning. it comes out of nowhere like a ninja

I was messaging jack about the school work, then all of a sudden out of nowhere he sent ninja dick.

by humansvs aliens January 1, 2017

Ninja Dick

An uncircumcised penis.

Ashley : Brady has a total ninja dick, it was so weird!
Amanda : Oh gross no way!!!

by TheGingeyy November 4, 2017