Green’s Dictionary of Slang

miker n.

[mike v. or Gloucestershire dial.]

a loafer, a scrounger.

1898
190019101920193019401950196019701980
a.1984
[UK]W. Pett Ridge Mord Em’ly 186: I’m a bit of a miker meself.
[UK]Partridge DSUE (1984) 737: [...] from ca. 1880.