WACKY Meaning of WACKY in English adj. & n. (also whacky) sl.adj. (-ier, -iest) crazy. n. (pl. -ies) a crazy person. wackily adv. wackiness n.[ orig. dial., = left-handed, f. WHACK ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012