Sentence:  Once you finally discover yourself a dismember-er, a de-limber, a fucking head-cutter-<WSD>offer</WSD>, the most simple of tasks — enjoying a long walk outside, seeing a movie, conversing with a stranger in the library — all become prized and over-inflated moments of elation. 
Meaning of the word marked with <WSD> tags:  "agent noun of '''off'''''