(n.) The presence of a third body in one's scrotum. Most likely cancer. Get yourself checked if you think you have a third testicle.
Douglas: "Neil, check this out! I have a third testicle."

Neil: "Doug, I hate to burst your bubble, man, but that looks like cancer."
by Blenderhead91 March 31, 2009
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For those who like to add crude meaning to an otherwise unoffensive term - "third wheeling"

Just like a pair of wheels, a third testicle will stand out, and should not be around(in most cases)
a) Oi, Pete, whose the third testicle?

b) Bobo hooked up with some chick, so i started third testicling
by Third Testicle August 3, 2009
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When a female deep throats your dick and all you can see is her head and your two balls
Wow you two must be close

Yeah she’s my third testicle
by Titty hickey September 2, 2022
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a uncommon slang used to show your distressed thoughts about something sexually displeasing.
nick: dude that guy has no dick! that is FUGLY!

austin: oh shit! i cant feel my third testicle!
by BUNCHO November 21, 2008
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Storing weed or other drugs in a kinder-egg toy container tucked in your underwear, near your nuts.
- Yo, look at that guy's crotch! I think he's sporting the Romanian third testicle!
- Damn right.
by MisterDeluge October 8, 2014
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Religious person: imagine a third testament- what would you add?
Me: Imagine a third testicle- How would you cum?
Imagine a third testicle- How would you cum?
by Zatarain’s Root Beer Drinker December 19, 2020
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The act of folding up a flaccid penis into a bun. BOOM the mystical third testicle. Try it after sex or jerking if.
Sally: "So what did you do next?"
Kim: " Well he/noodled me, so I explored the third testicle.”
Sally : "No way that's scandalous!"
Kim : "Dude if you want to weird a guy out just do it."
by AliceTheKink September 19, 2015
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