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gnat's ass

Very small measurement used by toolmakers & engineers, or roughly .0001 or one ten thousandth of an inch. Actual size may vary between shops, but always much less than a pussy hair. About one tenth of a skosh which is equal to approximately one nudge of the dial.

Note: When specified, generally regarded as smaller than the smallest one can measure or produce, since while most people intuitively understand that a gnat's ass is pretty small, few have actually bothered a gnat to measure one.
"Clearance is clearance, Clarance, but that die is only missing by a gnat's ass".
by aethernet September 4, 2006
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gnat's ass

Guy 1: Did you see the newbie at the party? I couldn't get near her all night.

Guy 2: Oh, yeah I saw her. I worked the floor for two hours and I was a gnat's ass away from her when she left with her friend.
by italknerdy October 27, 2011
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Slick as a Gnat's Ass

An unusually suave female possessed of a kind of amiable alacrity.
Well, ain't she slick as a gnat's ass!!!
by Aziz Ibrahim November 24, 2009
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gnats ass

Jon measured the wall and told me it was gnats ass!
by Genofam January 20, 2009
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