Cum Stamp

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

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Cum-Stamp

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"
OR
"Yo man, sorry about the cum-stamp on the shirt you lent me. You know how girls like to cuddle."

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