Green’s Dictionary of Slang

repap n.

also rephoop
[backsl.]

paper, e.g. a warrant.

[UK]New Sprees of London 14: [T]his dodge made the rumculls crabby, and they clapped the rephoop on him, and dubbed his gigger.
[US]J. Burkardt ‘Back Sl.’ Wordplay 🌐 repap: paper.