(British) A girl's breasts. It is a play on words. A "bouncing betty" is a name for a certain type of booby trap. Accordingly, it refers to boobs - breasts.
She reluctantly pulled down her bra to show her bouncing betties on the topless beach.
by AUDREY BRIONY August 3, 2017
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A booby-trap used by the NVA and VC in the Vietnam war. When a soldier tripped a wire, one of these shot up and exploded his torsoe.
He got taken out by a bouncin' betty.
by hobbes October 8, 2003
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A girl named Betty with big (.Y.) Typically wears no bra.
by MwiKaKaKa November 8, 2003
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A really annoying device in Call of Duty Modern Warfare 3.

It is essentially a claymore, but harder to spot and escape. In other words, the perfect noob weapon.
Aw man, All of these bouncing bettys are really annoying the crap out of me.
by w4tnryetmetu November 22, 2011
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A Bouncing Betty is similar to a boob job but with butt cheeks instead.
That stripper gave me one hell of a bouncing betty. Her ass was bouncing up and down my dick.
by Ridemerosie January 15, 2018
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Bouncing Betty- 1. an old flame or ex-girlfriend that never let go who pops up stirs up all kinds of old crap then disappears, an emotional land mine that pops up out of the bush to chest level and sprays shrapnel.
2. a woman or ex girlfriend who just bounces in and out of one's life
These are best spotted and disarmed prior to explosion. The best way to do this is to leave them under a BIG rock.
Bra I got this Bouncing Betty who lost her virginity to me who keeps popping up and telling me she's in a miserable abusive relationship.

Bra I have had this Bouncing Betty that I have been friends with for years, but we only talk when she's going through some shit with her old man.
by nineuvcps June 16, 2010
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A sweet-looking gal who hides that she's a natural man-eater. A woman who works relationships and men over, for her own benefit.
Willis: "I'm tellin' you. Watch out for her... she looks nice, but she'll do you in. She's a Bouncing Betty"
Arnold: "Whatchootalkin'bout, Willis?"
Willis: "Boom!"
by Paul Pangrazzi November 7, 2003
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