Noun. A mental device used to measure, usually on a 1-to-10 scale, how much you care or give a fuck. Not useful for articulating high degrees of giving-a-fuck, but perfectly useful for insinuating how little fuck you actually give.
This term is usually used when one does not care about anything... usually very angry and upset. Maybe just an ass hole but give the people who use this word a break because they may just be having a hard time in life.
Person 1: I studied all night yesturday for this test!
Person 2: I give no fuckedy fucks
Person 1: I give no fucks about your fuckedy fucks
Narrator: fuck-o-meter, how many fucks were given?
Fuck-o-meter: I don’t give a fuck