For a man to have rough, emotionally disconnected, vaginal sex with a woman.
Jim said to Charlie, "I'm going to take Sarah back to her apartment and smash her box in."
by Ozzy slanger October 22, 2009
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Slang term referring to the desire to have sex with a woman.
"Yeah I'd well smash her flaps in!"
"Her flaps need a good smashing!"
"I'm guna take you home and smash your flaps in till they fall off!"
"I'd love to smash your flaps in!"
by seany_baby April 22, 2009
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to smash a girls gash is to hurt her vagina during sexual intercourse by being to rough/voilentl.

by ooooox3 February 25, 2009
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when girl is sexy and a guy wants to have sex with her he might say he'd love to smash her back doors in, in the act of sex
by MrHighway March 25, 2011
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To indulge in anal sex, or indicate the desire to indulge in anal sex. To take some from behind sexually, anally.
She's fit, i'd like to smash her backbox in. Look at the ass on that, wouldn't you like to smash her backbox in.
by Hypnosid October 5, 2007
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