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When you're hitting on a female and she mentions her boyfriend to back you off.
I totally thought I was gonna get some until she dropped the b-bomb on me.
b-bomb by BonJoeV October 18, 2008
when one balaces books on ones boner as indicated

B-alancing
B-ooks
O-n
M-y
B-oner
"Hey Martin look at this b-bomb I got going on"

"Dammit man you got a bible there on that boner dude!"
b-bomb by marocpom February 14, 2008
Back off dude, don't go b-bomb on me now!
b-bomb by thelark November 7, 2003
Telling someone your relationship is over, especially in a cold, sudden manner.
He dropped the B-Bomb on her right there in the airport. Left her hard and dry in a 3rd world country to fend for herself.
b-bomb by gerry c. January 19, 2007
The casual insertion of the fact that a girl has a boyfriend into a conversation she is having with another guy. She may or may not have a boyfriend.

Purposes include:

- not leading the guy on
- not being attracted to the guy
- being faithful
Friend 1: So I saw you getting pretty friendly with Melissa last night eh?

Friend 2: Ya, but then she dropped the B Bomb on me. Totally lame.

Friend 1: Drag.
B Bomb by reygunz12345 August 4, 2010

Dropping the B-Bomb 

When a girl of interest casually includes the subject of her boyfriend in conversation. It's unexpected and requires you to reevaluate the current situation.
Boy, "So how was your weekend?"

Girl, "It was great, thanks! You would of thought it was funny. I got caught in the rain on the way back from my boyfriend's house!"

Boy thinking, "Damn, she was Dropping the B-Bomb. Oh well."
Dropping the B-Bomb by dfunk-5 March 2, 2011