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3.
The skin that connects the penis to the scrotum.

The "&" in Cock & Balls
Yeah baby, pinch my tweenis.
by Squeeky Clean Sanchez August 22, 2008
9 2
 
1.
n.see gooch. fleshy area between the scrotum and the rectum. Between the penis and the anus thus tweenis. That part you might hit if you fall riding a guys bicycle.
"My friend Kris fell straddling the back of a chair and luckily missed his balls but totally bruised his tweenis."
by anonymous March 27, 2003
35 12
 
2.
genitalia that is sizeably much larger than an "average-sized clitoris", and yet still smaller than an "average-sized" penis. it's somewhere in-between.

individuals labeled female at birth, and who have been on or are currently taking testosterone, often-times have such genitalia.

the longer word for such genitalia could be "clitweenis", but we'll just call it 'tweenis for short.
once i started taking testosterone, my clit definitely increased quite noticeably in size. now it's a 'tweenis!!!
by earthcrunch July 10, 2011
15 4
 
4.
a tweenis is part male and female preferably a male cat because it doesnt have penis that hangs out but it doesnt have a vagina either so its called a tweenis half twat and half penis
paws the cat has a tweenis.
people born with both sex parts usually have a tweenis
by Chrissy1987 December 13, 2008
5 4
 
5.
Portmanteau word, made up of "tiny", "weiner", and "penis". It's an insult similar to calling someone a "dick".
Stop being such a tweenis, dude!
by Goatrider March 16, 2006
7 21