Yeah, yeah, yeah --- obsessive compulsive...
What you sneeringly snort to everyone watching while you super-precisely perform an ordinary task, check/measure something extra-carefully, salvage da last drops/flakes/globs of a semi-valuable product, etc.
Low-income-but-financially-solvent dude, speaking to an amused gal whose car he's changing da oil in, and letting each bottle of oil drain into da engine's filler-neck for ten minutes before tossing da bottle in da trash can: "Yeah, yeah, yeah --- obsessive compulsive... but you know how I hate to waste anything, plus of course, YOU'RE da one who's paying all da costs of this oil-change, so naturally I wanna be all da more conservative and efficient wif salvaging all of da $3.99-per-quart oil dat I can!"