{ } n. [ G. wacke, MHG. wacke a large stone, OHG. waggo a pebble. ] (Geol.) A soft, earthy, dark-colored rock or clay derived from the alteration of basalt. [ 1913 Webster ]
(adj) ludicrous, foolish, Syn. wacky, goofy, whacky, zany, cockamamy, silly, sappy, Example:gave me a cockamamie reason for not going; wore a goofy hat; a silly idea; some wacky plan for selling more books