Definition: eff

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Source: WordNet (r) 1.7 

eff
     v : have sexual intercourse with; "This student sleeps with
         everyone in her dorm"; "Adam knew Eve" (know is archaic);
         "Were you ever intimate with this man?" [syn: 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]

Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

EFF

   Electronic Frontier Foundation

Source: V.E.R.A. -- Virtual Entity of Relevant Acronyms December 2001 

EFF
        Electronic Frontier Foundation (Internet, org.)