"to move about restlessly," mid-15c., perhaps a variant of frisk (q.v.). As a euphemism for "to fuck" it dates from 1590s, later "to masturbate" (1670s).
tr & in. to copulate [with] someone. (Usually objectionable.) : Bob and Mary were in the back room frigging.
tv. to ruin something; to fuck (sth) up. : Somebody frigged my rear bumper.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Example sentences
It keeps in the frig for a week or so, though, so you can use it again on other salads.