The best replacement for eff is aft.

The best alternatives to eff are rated as following:
★★★★★  aft
★★★★★  apr
★★★★  anc
★★★★  iec
★★★  agang
★★★  wn8
★★  ancyl
★  ufo
★  agang sa
★  ufo skyrim

Your alternative for eff is not listed? Suggest!
Speaking about eff, one probably shouldn't forget about malema.

Other search terms related to eff and their ratings are:
★★★★★ malema
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eff
aft
apr