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33.
In the context of the song "Boom" by Flight of the Conchords, it can quite literally mean anything.

While this is true, in many cases it seems to equate to a euphemism for sex/something related to sex.
-I wanna boom like it's never been done.
-It's the first day of boom and the flowers are blooming.
-I see you shakin' that boom, boom. See you lookin' at my boom, boom. See you want some boom, boom. It's clear it's boom time, boom, boom!
-You like boom. I like boom. Enough small boom, let's boom -de-boom-ah.
-He said he had his boom chopped off in a boom, but the crazy boom still wants to boom!
-We both get freaky and the boom gets leaky, then we boom, boom, boom, boom, boom, boom, boom!
-WHO'S DA BOOM KING?!

^All of the above are lines from the song
by Stoirm May 24, 2011
 
1.
Exclamation: Used as an oral exclamation mark but in a purely conversational context. Its function is not as heightened as the afore mentioned symbol so its impact is designed to simply reinforce ones point or statement. Generally found in light hearted, but not overtly humorous, situations.
Dinner's ready.... Boom.

Just quit my job... Boom.
by M. A. Larkin March 27, 2009
 
2.
A drinking game created at the University of Dayton. A combination of Beer Pong and Speed Quarters, where solo cups are filled a third of the way with beer and put on a circular formation. Two players start with an empty solo cup and a ping pong ball and try to bounce their ping pong ball into their cup. If they bounce the ball into the cup on their first try, they can pass the cup and ball to anyone else at the table. If they bounce the ball after their first attempt, they pass it to their right. If you bounce the ball into your cup and the person to your right has a cup already, you hit their cup off the table, yell loudly "BOOM!", and that person must drink a beer from the formation in the middle. The last person to get "boomed" has to drink a full beer.
Brah 1: Hey brah, want to play some boom?
Brah 2: Yeah brah, but we need to get some more Beast first.
Brah 3: Alright, let's head to the Deli.
by Dr. Dan Curran April 16, 2009
 
3.
Hallucinogenic mushrooms, used due to its rhyming with shrooms
Did you eat those booms?

I am so fucking peaking.

Really?

Purple Monkey Dishwasher.
by seleta July 29, 2004
 
4.
The sound protein makes when it goes everywhere.
Boom! protein everyhwere. ya'rly
by TheCon November 07, 2006
 
5.
1. When something is good, great or amazing.

2. When someone does something good, great or amazing.

3. When someone says something good, great or amazing.
"That club we went to last night was boom"

Boy smashes a window - "Yeah dats boom"

"Let's go down the park and get some cider" "Yeah boom"
by LuKe-87 January 10, 2006
 
6.
The defensive tactic that Muslim teenagers who are being bullied use to defend themselves. just yell, or write the word
Bully: Hey, ACHMED, give me your lunch money!
Ahmad: BOOM!
Bully:AAAAHHH
by spotlight January 17, 2009
 
7.
A term for big boobs
guy one: Gah!did you see her booms?!
guy two: Yeaa man! they were like G cups!
by nananaBatman September 22, 2009