another humorous term for thong. the fart is trapped in the underwear by the thong but travels down the fabric and into the vagina or back of the ball sack like a skate ramp.
After removing her pants, i was happy to discover she had a lovely lace fart ramp on.

Joe's ass explosion was so strong he almost blew out his fart ramp.
by shankdiggy July 10, 2011

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