Tw-EE-ner
/noun./

The act of one friend pissing in between the legs of another friend's while said friend is sitting on the toilet poo'ing.
Greg and I performed the tweener after I had an intense Chipotle attack.
by mrpopperspenguin March 16, 2012
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Often shortened to "tween". Definition is very similar to a goober. One who follows their own path and does things the "other" way. Is a comparable description to someone being weird but not quite as harsh.
You have velcro sneakers? You are such a tweener.
by Tweenmachine April 24, 2011
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Socks that reach mid-calf. They are neither low socks by one's ankle or high socks by one's knee, they are simply in between.
Tonight I wore my tweeners for the basketball game.
by KTZ10 August 25, 2009
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An acquaintance you sleep with in between serious relationships. The tweener has no long term potential.
Are you still seeing Chris?
No girl, he was just a tweener.
by jackiedax March 23, 2011
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A contraction of the words in between.

1) It is an item or person that is in between two things.

Examples: a) Something that is small between two larger things. b) A person stuck in the middle between two sides of an argument.

2) The middle person of a threesome.
This task to do at work is a tweener. We don't have to do as much work as that large project, but it is not a simple job either.

Jane is always the tweener of that threesome.
by KailaniDune January 13, 2023
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The flap of skin between a man's anus and his ballsack,
It is called a Tweener because it is "tween the balls and tween the anus."
Dude, I was sitting in study hall today and my tweener started to itch.
by Apolloxe October 31, 2009
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A very weak fart that you don't know if it was a qweef or a fart.
"Wow, that was weak, was that a tweener?"
by Cynicalsteve101 March 1, 2009
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