Green’s Dictionary of Slang

zeke v.

[proper name Ezekiel, seen as stereotypical of a countryman, in turn stereotyped as stupid]

(US prison) to give a haircut that makes an indivual look as if intellectually challenged.

[US]Rayman & Blau Riker’s 227: ‘I want you to zeke his head. I want you to make him look like a fucking retard’.