Top definition
A tattoo on the lower back thought to identify a woman as sexually promiscuous. Such a tattoo is a hypothetical target for semen should a man be having unprotected sex with a partner doggy style and decide to pull out just prior to ejaculation, hence cum coaster.

See: Tramp Stamp
"I pulled out and shot my load all over that tramp's cum coaster."
by Josepolis January 16, 2008
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug