FU

FU (plural FUs)

1. Initialism of follow-up.

FU (not comparable)

1. (philately) Initialism of fine used. (in stamp descriptions)

FU

1. (vulgar) Abbreviation of fuck you.
   • 2021, Isabel Waidner, Sterling Karat Gold, Peninsula Press, page 133:

     Rodney’s English was pretty basic that first year, but, according to Elesin, their face said FU, no translation needed.

FU

1. (law) Initialism of förundersökning (“preliminary investigation, pre-trial investigation”).

• FUP