mainstay 

-- main support
-- primary constituent

Objective, definitive and authoritative word meanings are the mainstay of language

mainstay by wclay1 September 2, 2009

Mainsta 

Maine's version of a wangsta.

Man that dude is such a mainsta!

Mainsta by Superman198919 April 1, 2009

mainstain 

your best friend that also happens to be a shit stain

"Happy birthday, fam, u my mainstain"
"Aw, fam <3"

mainstain by DrewTheDragon September 6, 2016

Mainstage Minnie 

Music festival goers that are not there for the music or general vibe. Mostly seen glued to phones for social media content and generally not aware that music festivals have more than one stage. These people gather their taste from social media trends and sounds.

Let’s see the insert basic artist here!

You sure? It’s gonna be packed with MainStage minnies.

Mainstage Minnie by SigmaKrill September 26, 2022