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1.
When a man/woman Cums on your chest. You've been chested on.
"girl i can't believe he chested on you
by @1964x Instagram August 28, 2013
 
2.
The slang's past tense for chest.
No Chested, Flat Chested, Big Chested, Perky Chested.
by Kendu March 02, 2009