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To purposely become intoxicated and either pass out or sleep on a floor/bed/sofa/animal/member of the opposite sex at an appropriate social event.
"Mark, are you smashing and crashing at that partay tomorrow?"

"Aye, I am pulling a 'smash and crash' tomorrow Alex"
by alexbericheath August 08, 2008
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2
A term used to describe a situation where a person sleeps with someone just to live at their house but has no intent on being with that person.
- So is this your girlfriend?
-No, she just won't leave.
-Oh so she's a smash and crash!
by 3withaC November 24, 2015
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