wail (v.) Look up wail at Dictionary.com
early 14c., from Old Norse væla "to lament," from "woe" (see woe). Of jazz musicians, "to play very well," attested from 1955, American English slang (wailing "excellent" is attested from 1954). Related: Wailed.
wail (n.) Look up wail at Dictionary.com
c.1400; see wail (v.).