Smashing trash is the act of two people fornicating who haven't washed their genitals within 48 hours. It can be anal, vaginal, oral, and any other holes that may exist. It is an act of love that should only ever be done between two people who love each other and are comfortable with each other.

*Warning* Do not try, as this can lead to infections and other potential medical issues.
Carl: Hey Bob, how's you and the wife?

Bob: Ah, you know how it is Carl. Haven't really gotten under the foreskin lately, because I have foreskin, and I don't think she's showered since Sunday, so we just smashed trash for a bit while the kids were sleeping in our bed.
Carl: I know how that is Bob, no judgement here. Jill and I are always smashing trash due to our complete lack of hygiene.
by TrashManDan January 01, 2018
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The outcome when white trash and black trash have babies together.
My unemployed, high school dropout cousin again knocked up his fat white trash baby momma with another smash trash.
by runbucky April 28, 2013
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Throwing a girl out of your place after a one night stand.
A man who kicks a girl out from his place after he's had sex with her. No cuddling is ever involved. "I have no use for her other than sex, tonight i'm going to smash and trash with no looking back."
by Carlo Pereyra October 13, 2007
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To bang (if given the chance)

or if given the chance, they wouldn't take it.
Bob: "like my status and ill tell you if i'll smash or trash"

Susie: *like*

Bob: "Smash"

Bob would rather bang susie, than trash her.
by smashortrashnotpass October 25, 2012
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A variant of hit it and quit it, fuck it and chuck it, or hump it and dump it - To fuck a girl and completely cut off contact.
Guy 1- So I might start dating Ashley...

Guy 2- Nah she's a bitch dude just smash it and trash it....

Guy 1- K.
by EthanMC October 08, 2010
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When your walking down the hallway at school and 2 groups of trashy people come up on either side of the hall and refuse to move so you get smashed between the groups.
"I was walking down the hall and was totally white trash smashed."

"I hate that hallway, there are so many white trash smashes down there"
by Immmalee February 12, 2009
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When you have sex with a girl (smash) and then shit talk her behind her back (trash). Generally only done by douches.
Person 1- Dude, that chick Ruby is a total buster.
Person 2- Didn't you nail her?
Person 1- Of course. It's the classic "smash n trash".
Person 2- Dooooooooouche.
by poony mctang July 11, 2010
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