pollock, v. — Green’s Dictionary of Slang

pollock v.

[? poll v. (1) or racist allusion to a Pole, i.e. a Polack n.]

(Irish) to trick, to hoax, to defraud.

1797

M. Leeson Memoirs (1995) III 203: A Mr S-t-y, [...] lived with me on the Rock road for a few months as my favourite Paramour; during which time he by degrees pollocked (to use a new phrase for cozening or tricking one), me out of considerable sums of money.