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cool or awesome (as used by people in Pittsburg, CA.)
My new bong is hella mainy bro.

Last night i got so drunk, i peed in my bed. It was so not mainy bro.
mainy by ashhaspms247 January 22, 2006
Related to Mainiac. When you loose it. To trip out. Go crazy.
Arturo went mainy in Aikido last night and threw one of his classmates through a window. What a beast.
Mainy by Kwasi August 17, 2004
Drivng your car, (preferably a pulsar) riding a bike or walking down a main road. Also there are music mainys.
Me and my boys drove ma pulsar doing some mainys.

Did a walking mainy down Hollyrood Court.
when a group of adolescent male humans drive along the main road or 'main strip' in a city in a car, with the purpose of observing the local female humans, or to 'show off' the prowess of their motor vehicle
"hey lets take the car out for a couple of mainy's, and pick up some bitches"
Mainy by kiwi42 November 17, 2011
It literally means any descriptive word you want based on the context of the sentence. Its an all inclusive adjective that is limitless to any possible uses.
My brother died in a mainy car accident.
I'm going to a mainy club later.
Bruh, that shootout was mainy.
I have a mainy doctor.
That tackle was mainy.
Where was the restaraunt with the mainy food.
Mainy by nuricksmainy July 15, 2019
main person in a competition dominates so they are a mainy

often seen in counter strike
Mainy by chris darke June 9, 2005