The GAF or "Give A Fuck" Meter is a general scale used to gauge one's overall interest/productivity/willingness to engage in an activity or function. Although routinely applied to work or employment situations, the GAF Meter concept can be used almost universally. Workplace observations have shown GAF Meter readings dramatically dip as proximity to the "weekend" decreases.
"Man, Friday afternoon, and my G.A.F. Meter is running critically low"

Person 1: "Pegged high on the G.A.F. Meter...trying to save the world today"
Person 2: "Stay hydrated. Don't want to pull a hammy"
by HotDogPants September 21, 2018
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