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1.
The bra that gives horny men false hope by giving flat-chested women impressive-looking breasts and cleavage.
The reason they call it the wonderbra is because men wonder where the titties went when the bra comes off.
by bigtones June 15, 2007
 
2.
Man's greatest invention; it's a breast-enhancing bra that lets small-breasted women look as though they've got an impressive rack.
All my friends think my girl's got big cans, but she doesn't...she's just wearing a WonderBra to make her chest look bigger!
by 'Drew August 16, 2003
 
3.
The source of ungifted women's happiness, and false advertisement for men.
"Nice rack, girl!"

"Thanks..." ~Removes bra~

"What the HELL!? Uh, gotta go!"
by Morbidia May 29, 2005
 
4.
It's called a wonder bra because once it's removed you wonder where they went
A: She had a killer rack but when she took her wonder bra off, they were gone

B: That's crazy man
by Cornelius T Durden April 14, 2010