functiontration

n. The faculty which is required to complete basic manual tasks. Often impaired by hangovers, substance abuse, etc. One may have the concentration required, but not the functional ability, or vice-versa.

a portmanteau of functionality and concentration.

(also v. functiontrate)

I'm so fucked, I don't even have the functiontration to roll a cigarette.

I'd like to cook you breakfast, but I don't think I can functiontrate for long enough.