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1.
To have sex on school grounds, especially when caught by a security guard.
It was so embarassing when we were caught closhing in the stairwell.
by JayTheSecurityGuard April 04, 2011
 
2.
When a couple is so together that they have become one being.
1: Did you see them? They're so closhed.
by curlypube March 31, 2010
 
3.
To be struck violently in the head or stomach, or the result of consuming a high number of alcoholic beverages in a short time period.
Terry closhed his friend Cordia upside his noggin because of his Democratic beliefs.

April went to the local pub to enjoy a pitcher of beet and got closhed.
by ZenCord August 19, 2008