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
2. a huge jackass/annoyance
3. someone that is rele rele ugly
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.