clumsy; ineptly executed. Likely derived from a time when the left hand was used for cleaning one’s posterior after movements, and the right hand reserved for anything else. Therefore anything executed with the left hand is perhaps sub-standard. Almost all scatological etymologies are historically false, but they’re more amusing than the polite ones. The sad truth of life is that more of our language derived from the Viking term for “baking tray” than some sort of acronym which spelled “FUCK.”