A fictitious condition that is used to insult someone who's backside is straight as a board. The person the joke is about usually is wearing pants that makes them look like they have no ass at all. The person may also end up with the nickname R.A.S. - Pronounced Rass.
Hey...Hey, Dude! Look at that chick!

Yeah, man. She looks like she's suffering from Receding Ass Syndrome.

Sister: What do you want?

Brother: I just wanted to see how bad your condition has gotten, R.A.S.
by Dregyn August 21, 2011
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Despite its name, the Receding Testicle refers to an area that is found in both males and females. In males, it is located where the testicular sac terminates inferior to the anus. In females, it is located where the vagina terminates inferior to the anus.
After 3 years of trucking, Mike's Receding Testicle developed a boil.
by Pillar Nasty September 9, 2016
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