1. strange, odd; crazy, loony, silly (Slang). silly, foolish, kooky, nutty as a fruit cake Lucy sometimes does wacky things - like, one time she sent ice cream in the mail. wackyadj. 2. (informal terms) "gave me a cockamamie reason for not going"; "wore a goofy hat"; "a silly idea"; "some wacky plan for selling more books" [syn: cockamamie, cockamamy, fool(a) , goofy, sappy, silly, zany, unreasonable]. 3. informal or slang terms for mentally irregular [syn: balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty]. 4. A soft, earthy, dark-colored rock or clay derived from the alteration of basalt. 5. If you describe something or someone as wacky, you mean that they are eccentric, unusual, and often funny. a wacky new television comedy series. silly in an exciting or amusing way = crazy (WHACK).
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