cacks /kæks/ noun[plural only]2 •(Ireland) Trousers.'Timothy,' pronounced the gargoyliest, 'Cavendish, I presume. Caught with your cacks down.' — 2012 •Underpants.I hadta strip down t'my cacks. And I just looked attum: 'Ah, hey...Y'know well I don't've any books down my cacks, or up my ass.' — 2016
