exclamation to call attention, by 1913.
also boohoo, 1520s, originally of laughter or noisy weeping (now only of weeping); see boo. As a verb from 1838.
"opium," 1887, from Cantonese nga-pin (pronounced HAH-peen) "opium," a Chinese folk etymology of the English word opium, literally "crow peelings." Re-folk-etymologized back into English by association with hop (n.1).
"of or pertaining to the kidneys," 1650s, from French rénal and directly from Late Latin renalis "of or belonging to kidneys," from Latin ren (plural renes) "kidneys," a word of of uncertain etymology, with possible cognates in Old Irish aru "kidney, gland," Welsh arenn "kidney, testicle," Hittite hah(ha)ari "lung(s), midriff." Also possibly related are Old Prussian straunay, Lithuanian strėnos "loins," Latvian streina "loins." "The semantic shift from 'loins' to 'kidneys' is quite conceivable" [de Vaan].
