Plain 

Someone that thinks cursing (expressing negative feelings in words that don't sound sweet) and anything not G rated or Disneyfied is inappropriate for everyone (just like walking around with no mask and hand sanitizer is inappropriate for everyone to plain adolescent souls). The kind of person that would hire a hitman to kill somebody then still talk about other people doing bad or inappropriate things.

Though he/she was always a clown, he/she was never really funny, because he/she was always a plain Mickey Mouse Club kind of clown. He/she claimed that people respected him/her, but the reality was that nobody owed him/her anything, including respect.

Plain by The Original Agahnim December 5, 2021

Plain 

Green, Prometh, Plain
Promethazine Oral Solution - an antihistamine used recreationally for its drowsy and euphoric high and effects.

Plain - “I just poured up sum plain”

Plain by Hood_rich3000k November 23, 2023

plain white rapper 

Really, I mean really bad hip hop music purveyors.

Bad music comes in a plain white rapper.

plain white rapper by bustapost December 19, 2017

plain wrapper 

'70s CB slang for an unmarked police car, usually used with the color of the car between "plain" and "wrapper."

There's a plain wrapper, blue, up at mile marker 128.

plain wrapper by oneoldgeezer November 6, 2007

plain cock

a penis that has no special distinctions or markings. its just a plain penis.

hey i had sex with a plain cock last nite and it was real simple

plain cock by penis54321 October 4, 2009

Plain old stupid

Something or someone who fits into the category of normal stupidity. Plain and old merrily describe the word stupid. The something or someone is not necessarily plain or old.

He couldn't use his printer because he didn't turn it on. He wasn't drunk; he was just plain old stupid.

The boy didn't pass his test not because he didn't study, but because he was just plain old stupid.

Plain old stupid by Kingeikaiwa February 15, 2012

Plain Bagel 

Someone who has no "stand out" features and who is boring as hell--just like a plain bagel--no cream cheese, no jelly, no sesame seeds, NOTHING.

Anthony: Are you inviting Janet to your birthday party?
Yvette: Yes, why?
Anthony: Ughh! Don't invite her! That bitch is such a plain bagel! She'll suck the life out of your party.

Plain Bagel by BlackieDC January 29, 2009