Green’s Dictionary of Slang

implement n.

1. a fool who is persuaded to take part in a dangerous or foolhardy enterprise.

[UK]Dekker & Webster Northward Hoe IV i: Away I love no such implements in my house.
[UK]B.E. Dict. Canting Crew.

2. the penis.

[UK]Randiana 102: She [...] had the implement put in her hand to quiet her. It is true that she was a bad judge of size, or she might have hung back.