Definition

A blend of 'thief' and 'tweaker'—describing someone who steals, likely driven by drug addiction or substance abuse. It's the unfortunate combo of criminal behavior and addiction problems.

Example Usage

He tested positive for meth and we started noticing merchandise going missing; turns out he'd become a thieker and we had to let him go.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=thieker&defid=8825938)