Green’s Dictionary of Slang

charper v.

[Ital. cercare, to seek; for an alternative ety. see letter from WS Wilcox at charver v.]

(Ling. Fr./Polari) to search.

[UK]Partridge DSUE (8th edn).
[UK]P. Baker Fabulosa 290/2: charper to seek.

In compounds

charpering carsey (n.) [carsey n. (1)]

(Ling. Fr./Polari) a police station.

[UK]P.H. Emerson Signor Lippo 48: Before you can open a paddin-ken, you must get a licence from the charpering carsey.
[UK]P. Baker Fabulosa 290/2: charpering carsey a police station.
charpering omer (n.) (also charpering omee, ...omi) [omee n. (2)]

(Ling. Fr./Polari) a policeman.

[UK]P.H. Emerson Signor Lippo 27: It would crab the deal if a charpering omer was on the beat.
[NZ]W. Ings ‘Trolling the Beat to Working the Soob’ in Int’l Jrnl Lexicog. 23:1 64: In avoiding the attentions of a charpering omi (policeman) he might often frequent a nochy bog (a toilet that attracted men at night) or a goolie bog (one that had been vandalised to remove light fittings.
[UK]P. Baker Fabulosa 290/2: charpering omee a police man.