mainstone

often used instead of the word cock.

"wow ur the biggest mainstone ive ever seen!"

by tajsgu122 June 21, 2008

Zac Mainstone

Make way for Noddy. NODDY!

Zac Mainstone looks like Noddy

by gph123 November 28, 2019

Mainstone

European custom.

Also used as an exclamation meaning "cool" or "rad".

"I gotta go check on Mainstone guys."
"Fuck off."

"Did you see Sarah?"
"Yeah, her top was so mainstone!"

by Smoothbrain420 October 26, 2023