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Internet lingo for "matey", a slang word for friend. Not to be confused for a firework.
"Here's that firework video you requested"
"thx m80"
"No they're just roman candles"
"u wot m80"
"Uh, no M-80's. Did you get the right video?"
"fo sho m80"
"...Okay whatever"
by poopybottoms May 16, 2014
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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.
by Swedishhotpocket September 25, 2008
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An explosive firework. Was sold in the United States until the Child Protection Act banned them in 1966 because of the large amount of injuries due to mishandling or stupidity. An M-80 is usually about 1-1/2" x 9/16" with the inside of the tube filled with flash powder. One M-80 can easily remove fingers or send particles into the eyes causing permanent blindness.
"Dude, did you see that M-80 go off? It blew apart that entire mailbox!"

"I know I don't have a hand anymore, I lit an M-80 in my hand and it just blew it clean off. I would give you the finger but I have none left."
by Jack the Anarchist April 05, 2006
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A small cylindrical explosive device containing potassium perchlorate and aluminum, used to make lots of noise or destroy small objects.
Here's an M-80, let's blow this shit up!!
by Everyzig2101 December 23, 2003
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A side fused illegal firecracker/salute.
Usally contains 3grams of flashpowder.
M-80s go boom................
by Bleh July 28, 2004
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M-80s were invented by the military long ago to simulate grenade explosions during training missions. Soon they became extremely popular with the public, and were sold as large firecrackers. But the Child Protection Act of 1966 made M-80s and cherry bombs illegal to manufacture in the United State
I blew my finger off playing with an M-80.
by Paisa July 01, 2005
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A firework that contains about 3 grams of pyrotechnic powder. Most M-80s are actually pieces of crap that contain tiny amounts of powder compared to genuine M-80s (firecrackers are called M-##, where ## corresponds to the amount of powder it has in grams). Illegal since 1966.
Real M-80s were so strong that the military used them to simulate grenade explosions.
by The Mr Needles Experience September 27, 2007
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