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A type of firecracker that is quite effective in bothering local neighbors, family pets and of course, senior citizens.
After Doug lit an M80 on the back porch, Mr. Jenkins was in need of a new pair of underpants.
M80 by Swedishhotpocket January 13, 2009
A shorter way of saying matey, usually on the internet. Also used by pirates.
Yarrrr, m80!
m80 by CokRubbin May 20, 2015
a shortened version of "matey"
also used by pirates using internet chat
Pirate 1: ahoy m80
Pirate 2: ahoy m80 lets chat
m80 by TSwany July 2, 2016
people for whatever reason, consider m80's to be "fireworks" or "firecrackers". but dynomite is an explosive, and whats an m80? quarter stick of dynomite!!

they don't make big colorful sparks in the sky, nor small colorful sparks on the ground/partially in the air. no,the soul purpose is to literally blow something up with an m80. a solid object, not just blown of for the hell of it. make sense? stupid? idk. idc. it's just my point.
m80. there's the freaking example.
m80 by y2c July 6, 2011
A word for meme lords when they want to act like a pirate without giving up being MLG
Hey M80, wanna 1v1 me on bo3? Snippers only.
M80 by M9/memelord September 21, 2016
Meighty or M80 is a combination of an "m" and "80" which forms the sound matey which is something you call your friend.
Greg is texting Tom
Greg- How are you doing M80
Tom- Good
M80 by SenseiPanda June 26, 2017