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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A true gentleman. One of the last few of a dying breed. A humble motherfucker with a big-ass dick.
Hoe #1: Who is that sexy piece of ass?

Hoe #2: Oh, that's Boomer! Chicago's finest. 773 represent!

Hoe #1: I would totally hum "The Farmer in the Dell" while going down on that man.
by there you go!!! November 06, 2011

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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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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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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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A goal scored in football/soccer with a lot of power usually from out side of the box
Guy 1: "Did you see Luka's goal?"

Guy: "Yeah, was a proper boomer!"
by LosReyes March 21, 2013

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An annoying "special" zombie in Left 4 Dead 2. It's a fat-ass zombie that throws up on you, making your sight all loopsy like you're on an acid trip.
Man, Boomers are the worst!
by Billy_Fucking_Mays October 26, 2012

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