diaper stain 

1- streak of fecal matter on a cloth/disposable device meant to intercept human infant waste product as it exits the posterior.
2 -put down, like 'doody head' based on the undesiribility, and vileness of the substance of the stain being used as a metaphor for the qualities of the individual to whom the remark is directed

In Blade Runner 2, L Samuel Jackson called one of the other werewolves a "human diaper stain".

diaper stain by SMODNUK September 30, 2007

Diaper Stain 

The wet marks that appear on lighter colored clothes when the diaper they are wearing leaks but the marks appear in such a way that they could only have come from a leaky diaper rather than the person peeing their pants.

Hey look over there, Mike's got a major diaper stain

Diaper Stain by iminpampers May 20, 2011

diaper stain 

1. a stain on a diaper
2. a huge jackass/annoyance
3. someone that is rele rele ugly

1. that baby left a huge diaper stain
2. Guy 1: dude that guy talked about my momz
Guy 2: don't worry about him man he's a diaper stain
3. That Julie looks like a massive diaper stain.

diaper stain by coheedboy_4 October 8, 2007