(noun) Meaningless expletive similar to "rat's ass" or "ratfuck," only more emphatic, a monkeyfuck being a step up from not giving a rat's ass or not giving a monkeyfuck.
I told him that I didn't give a rat's ass if he didn't like my fucking his girlfriend and he said he didn't give a monkeyfuck if I didn't like the beating he was gonna give me. Anyway, that's why I'm in the hospital. The doctors here don't give a monkeyfuck ... I almost never see one ... and my catheter bag is overflowing and is starting to turn bloody.
ratfuck don't give a fuck don't give a rat's ass don't give a ratfuck fuck-a-doodle-doo