8
A nickname for Mushrooms.
Mushrooms that a can be consumed in order to alter the mind state in such a way that you may begin to hallucinate and see colors as well as many other objects that may or may not be actually there in reality.
Hey man just bought a half ounce of boomers, you wanna trip?
by Kevin420 December 20, 2007
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9
1. slang for psychedelic mushrooms
2. a nickname for a (loud) father
those were pretty good boomers you got last week.

i really hate it when boomer doesn't wear a belt.
by blistre April 18, 2005
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10
an overweight, tag along friend that ruins things for the guy trying to get with the girl (the hot girl who is the boomer's friend).
HOLY SHIT GIGI IS SUCH A FUCKING BOOMER. IM TRYING TO GET WITH SARAH, BUT HER FAT, BOOMER FRIEND GIGI IS ALWAYS AROUND
by timhunter5 September 23, 2009
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11
US Navy slang for a ballistic-missile submarine.

http://en.wikipedia.org/wiki/Ballistic_missile_submarine
The US Navy boomers are the Ohio-class.
by Axeman73 April 09, 2009
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12
An act in which a person grabs the sides of a metal folding chair tightly, pulling the ass as close to the seat as possible, and then farts as forcefully as possible.

The boomer reverberates loudly in all directions and resonates through the chair.
Tom: "Holy crap! Did you hear that?"
John: "Yeah, what was that, a gunshot?"
Tom: "Naw, Vinnie just did a boomer!"
by ctenah April 05, 2009
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13
another word for a male kangaroo according to fact # 185 on snapple...or a nick name for a certain guy....
jack: "goood morning mates! today we are going to be looking at boomers...and you will see one if you look outside the window on your right...."
by like im going to tell you August 27, 2005
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14
Those who think they can drink a lot, end up drinking too much and puke their guts out resembling a boomer from the Left 4 Dead video games series where a boomer pukes on players.
Holy shit! I can't believe Brandon drank that much! He looked like a total boomer when he was puking his guts out!
by King Schrong June 04, 2011
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