Green’s Dictionary of Slang

1. (US) pertaining to the Federal government.

1951		W. Winchell On Broadway 13 May [synd. col.] Justices Learned Hand and cousin August Hand [...] will soon leave the Fed bench.
1958		J. Blake letter 11 Feb. in Joint (1972) 114: He got out of Springfield (fed mental joint).
1999		J. Ridley Love Is a Racket 36: You do federal time, and a fed pen is nothing but badasses and lifers.
2012		‘Dutch’ ? (Pronounced Que) [ebook] These are some of the members of Don Baron’s team that got fed time and ultimately cooperated with the government.
2017		S.M. Jones August Snow [ebook] ‘I really don’t care about you and your fed buddies so long as it doesn’t embarrass me’.
2023		Rayman & Blau Riker’s 262: [He] went back to the feds to finish his fed time.

2. (UK black) pertaining to the police.

2016		A. Wheatle Crongton Knights 126: I spotted three parked fed vans.
2020		G. Krauze Who They Was 5: A fed car comes screaming up the road [...] blue lights spinning off onto buildings.