lickety-split (adj.) Look up lickety-split at Dictionary.com
1852, American English; earlier lickety-cut, lickety-click, and simply licketie (1817), probably a fanciful extension of lick (n.1) in its dialectal sense of "very fast sprint in a race" (1809) on the notion of a flick of the tongue as a fast thing (compare blink, snap).