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Any girl (or guy) who is valued as lower than a 5 in the hotness scale. Sub-Fives are usually referred to denote if a girl is acceptable to hook up with or not.
Friend 1: Dude, that girl you brought home last night better not have been a sub-five.

Friend 2: I don't fuck around with sub-fives, don't worry bro.
by CalDaddy May 10, 2014
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