Green’s Dictionary of Slang

funker n.1

[funk v.2 (1)]

1. [19C] a petty criminal, rated as the lowest order of thieves.

2. [mid-19C+] (also funkstick) one who is a coward, a weakling or a shirker [funkstick orig. foxhunting j., one who shows cowardice in the face of jumping a ‘stick', i.e. a fence].

3. [late 19C] a prostitute who quits the streets when the weather is bad.