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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."
tweenis by Anonymous March 27, 2003
Related Words
Something that looks like it's made for tweens, but is only ever bought by soccer moms for their kids thinking it's cool.
Look at that kids bop album. It's so tweensy.
Tweensy by Raenyn December 18, 2016
To the point, teenus means a tiny penis, however the combination of spelling is altered. However, it is used as a mild offence, such as poo, egghead, and bumface.
"OMG, that Lee Kersen Mascerenhas is such a teenus, he is always eating sausage".
Teenus by EJHERBS December 15, 2010
The skin that connects the penis to the scrotum.

The "&" in Cock & Balls
Yeah baby, pinch my tweenis.
Tweenis by MysticOgre October 16, 2008

Tweenster 

Suburban white bread 5th and 6th graders, who think they know everything, and do not want to be referred to as "children".
-They have no real music tastes of their own, and just listen to what's on the weekly top 40 chart, because they think it makes them seem "cool".

- Frequently shop at stores like "Hollister" and "Aeropostal" with the 200 dollars their parents give them for clothing that they "need". These tweenies think it's cool to shop in the "teenager" stores, and buy all the size 0s and Xsmalls.

-They often have high priced electronic accessorys that no 10 year olds needs. Such as an "iPhone".

-Most have either Middle aged mothers who still think they're 20, or overweight, dumpy moms who try to live their life through their child.

-Warning! they will get extremely offended if you in any way imply that they are still a child.
Normal 10 year old- "Wanna go play with dolls?"
Tweenster 10 year old- "WTF no, dolls are for 9 year olds, stupid."
Tweenster by PseudonymixYah March 14, 2009

tweenish 

To behave or speak in a manor that resembles that of a 12 year old girl.
"Omg! you ate that?? GRODY!!!" -tweenish!!!!
tweenish by Alastigirl January 22, 2012