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be tight-arsed or tight-assed(British & Australian, very informal, American, very informal)

to be worried about small details that are not important.

Cambridge International Dictionary of Idioms © Cambridge University Press 1998

Don't ask Jack to get involved, he's so tight-assed and really irritating.
by dulcederonda January 30, 2008
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Nov 23 Word of the Day
A massive dump that takes 10 to 15 times to flush.
After Thanksgiving, I had to Take a Trump.
by JRBIV December 11, 2019
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When everyone keeps good/fun things to do on the down low, such as a good house party.
Theres never anything to do cause everyone around here is so tight assed all the time
by pctvguy March 16, 2008
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