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A whole lot of friction down there. Also known as outercourse.

See also Rubs Merchant
Alastair loves to welsome new friends by giving them dirty rubs.
by Alastair February 25, 2004
A part of foreplay where the male inserts his thumb into the vagina and the index finger into the rectum and begins to the rub the thin lining between the cavities. Add the tongue flip for maximum benefits.
Last night, I pulled out the dirty rub. I couldn't believe how loud she screamed.
by Scotty D April 11, 2006