The hair surrounding one's ass hole. A deterrent to anal sex and obsolete pre-historic filter for the rectum.
She wanted me to cram the prick in her tookis, but that rumpstache was unshaven and had a couple Corn Nuts tangled in it, so I just beat off in her hair.
by Killy Pistol January 10, 2008

13 Words Related to rumpstache

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