出典:Wiktionary
Origin unknown. Early entries for fleek in the Urban Dictionary date to 2003 (defined as “smooth, nice, sweet”) and 2009 (“awesome”); perhaps as a blend of fly (“well dressed, smart in appearance; in style, cool”) + sleek. The term was popularized by a video posted on the online video-hosting service Vine on June 21, 2014 by Chicago-area teen Kayla Newman,[1] under her username “Peaches Monroee”, in which Newman, who had just had her eyebrows done for the first time, proudly declared “eyebrows on fleek”. She claimed that the term “just came to [her] out of the blue”.[2] Lexico suggests it is “apparently an arbitrary formation”.[3]
on fleek (African-American Vernacular, slang)