Green’s Dictionary of Slang

piked off adv.

[pike v.1 (1)]

safely escaped.

[UK]B.E. Dict. Canting Crew n.p.: Piked off, c. run away, fled, broke.
[UK]New Canting Dict. [as cit. c.1698].
[UK]Bailey Universal Etym. Eng. Dict. [as cit. c.1698].