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1. euphemism for fuck: eff off.
2. eff and blind slang to use obscene language
ˈeffing n, adj, adv
Past participle: effed
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|Verb||1.||eff - have sexual intercourse with; "This student sleeps with everyone in her dorm"; "Adam knew Eve"; "Were you ever intimate with this man?"|
bonk, do it, fuck, get it on, get laid, have a go at it, have intercourse, have it away, have it off, have sex, be intimate, lie with, roll in the hay, screw, sleep together, sleep with, make love, hump, jazz, love, bed, bang, make out, know
neck, make out - kiss, embrace, or fondle with sexual passion; "The couple were necking in the back seat of the car"
fornicate - have sex without being married