Definitions by Meish

bym muscles 

Beat your meat muscles - biceps muscles guys get after beating their meat off.

Dude your muscles aren't real, they're just bym muscles

bym muscles by Meish September 16, 2017

Green Mushroom 

A person who insists on one-upping you everytime.
Derived from Mario Bro's -1up

Person A: "I sprained my ankle the other day."
Person B: "Yeah well I broke my ankle once and got the flu. Plus I haven't slept in 48 hours. I'm so tired."
Person A: "You're such a Green Mushroom, Nick."

Green Mushroom by Meish January 14, 2009