Etymology
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eff (v.)

1943, euphemism for fuck, representing the sound of its first letter. Related: Effing.

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Definitions of eff

eff (v.)
have sexual intercourse with;
Synonyms: sleep together / roll in the hay / love / make out / make love / sleep with / get laid / have sex / know / do it / be intimate / have intercourse / have it away / have it off / screw / fuck / jazz / hump / lie with / bed / have a go at it / bang / get it on / bonk
From wordnet.princeton.edu