Simple past tense and past participle of knack.(verb)
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Use "knacked" in a sentence
"After realising that only 12 people and a mangy dog bother playing football in Australia, new Sheilaroos coach Holger Osiek has resisted calls for perma-knacked winger Harry Kewell to quit the national team."
"That ghostly figure hanging round Man City's training ground rattling his knacked legs, is none other than Roque Santa Cruz: he's been left out of the club's Big Vase group stage squad."
"I'm on a railway platform trying to get to work during a period of heavy storms (service is totally knacked) and I'm in uniform with a crowd around me seriously dis-chuffed and about to remove my nipple rings without unclipping them."