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The act of cumming on a girls lower back where the "tramp stamp" is. This will render said "tramp stamp" illegible.
yo dude i totally railed that bitch from behind last night and turned her tramp stamp into a cum stamp
by suppper 17 July 17, 2010
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When a person gets cummed on and then presses their body onto a sheet, person, pillow, etc. leaving a perfect stamp.
"My boyfriend came on my stomach again last night, so I totally cum-stamped his pillow"
"Yo man, sorry about the cum-stamp on the shirt you lent me. You know how girls like to cuddle."
by mcguide October 12, 2011
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