Abbreviation for Fucking English Bastard/Bitch.
Used frequently by Jocks, when referring to their neighbours south of the border.
Fish Eating Bastards as a Glaswegian (or Weegie) would describe the East Coast Jocks. Especially prevalent use amongst members of the Scottish Transport Regiment RLC(V) (Scot Tpt Regt RLC(V)). West Coast Squadrons describing the dirty, filthy FEBs who inhabit the East Coast Squadrons - especially those from 230 Transport Squadron.