The girl you are sleeping with but she is not your main girl or wife. Normally you go out to a club and you meet a girl and have sex with her. Although the sex was great because you have a main girl or wife you cannot make this chick you main girl so she becomes someone you can have sex with but not a long term relationship. Usually this is a smut who has slept with many other people that ar in your circle of friends.
John: Joan is my shorty on smash because my main girl or wife is pregnant.
by teamnegativetweet January 18, 2012
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Smashing guts.

The act of rubbing guts together during intercourse. Also can be another name for sex.
Fuck! We were smashing guts all over the place last weekend!

I hope tonight he plans on smashing guts!!!
by The limpest dick June 25, 2018
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When you get wild, and you smash a lot of people in one night, or it's a one night stand, but you smash multuple times and you wake up sore and humiliated
"Hey Bob, you good? You don't look to good this morning?"
"Nah dude, I was up until 2 smashing, and now I have a killer smash over"
by Jacaranda1027 December 21, 2017
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Mark: "Did you hear about John?" Jessica: "Naw" Mark: "He got 2 years for smashing-reef"
by Truthonsomenonsense May 17, 2011
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