B.O. 

<noun> Slang abbreviation;

Literally, Body Odour. The smell that it created when bacteria feeds on sweat hence making it stale. Often unpleasant.

SIMON: "Charles, you have B.O. Go and wash your armpits!"
CHARLES: "I have taken your offensive statement and unmitigated imperative into account and have calculated an appropiate answer to your utterance: No."

B.O. by Stuart Fletcher January 18, 2005

B.O. 

body odor
when u dont wear deodorant n ur armpits smell like shit

johnnys u reak man wear some deodorant uve got b.o.!

B.O. by someone December 17, 2003

b.o. 

A person's natural, unaltered odor, particularly that which emanates from one's underarms. B.O. can smell like brie, diesel engine, sukang paombong, or freshly mowed grass, to name a few similar odors. High school locker rooms and frat houses are locales notorious for the smell of lingering B.O.

A wifebeater is an excellent way of showing your sukang paombong B.O. off, since it does not cover your armpits.

b.o. by Dylan Dude December 13, 2007

B.O. 

Short for "blackout," as in drinking entirely too much alcohol, sometimes combined with other substances. Can be used as a verb, a noun, or an adjective. On a scale of 1-10, B.O. stands for all numbers 11 and higher, and is almost always associated with belligerence and depravity. Much like alcohol itself, the term is used heavily in Wisconsin.

Verb: Let's get Rumplemintz and B.O. tonight!
Noun: That kid is a walking B.O. every weekend.
Adjective: I was completely B.O. last night, don't remember anything.

B.O. by General Corn Wallace March 5, 2011

B.O. 

A person's natural underarm odor.

So-and-so has B.O., because he doesn't use deodorant.

B.O. by Anonymous August 24, 2003

B.O. 

When your in a taxi and your friend is tryin to hint to you ur weed is so dank its stinkin up the car without the driver.

YO MAN! you smell like mad B.O.

I do? (sniffs his armpits)

NO the other BO!

oh shit! (opens all the windows)

B.O. by Fattyblunts392 September 12, 2009

b.o. 

Booty odor, like a horrendous odor from one's booty.

Person 1: Ashli from A Shot at Love with Tila Tequila had some bad b.o.
Person 2: Body odor?
Person 1: No, booty odor!

b.o. by C & A Dynamite January 9, 2008