Green’s Dictionary of Slang

(UK Und.) one who approaches another man, accuses them of homosexual advances and threatens to go to the authorities if they do not pay blackmail money.

1819

Chester Chron. 29 Jan. 3/5: These were noble sentiments [...] sentiments to which every smasher, trapper, kidlayer, ring-dropper [...] and forger of bank-notes present, would heartily subscribe .