lickety

Somewhat disputed. The Oxford English Dictionary suggests either the verb or noun lick “stroke with the tongue”, with -ety, a suffix used to extend monosyllabic words. Merriam-Webster supports OED, deriving lickety-split from the same senses of lick. Harper's Online Etymology Dictionary, in contrast, suggests it is a variant of the noun lick “sprint; rate of speed”. Some writers suggest that lickety-split may be onomatopoeic – compare clickety, clicketty-clack – but they note this as personal opinion. The word is attested, with variable spelling, from the 19th century; see quotations below and at Citations:lickety.

来源：wiktionary