used by machinist to describe the fit of a screw into lug or nut, but referring to a women vagina.

For example, one is a as loose as they come, but a four fit is extremely tight.
That girl looks like a one fit.
by Penetrator54959048504feffdv October 25, 2009
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of broad or universal application (from a label on clothing products that indicates they can accommodate the size of any wearer)
War is not a one size fits all solution.
by Light Joker October 17, 2006
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(Phrase) With only a tiny minoritory of exceptions, everyone should be happy with the decision.
Hitler commiting suicide was a one size fits all action
by Gumba Gumba May 15, 2004
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A silly marketing term used to describe an item of clothing that doesn't fit anyone.
John: "Ugh, I bought this shirt from the mall yesterday and it doesn't fit."
Mary: "Well, obviously. It's one size fits all."
by bill of swift January 16, 2016
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