Cockney rhyming slang to call someone a moron. Jack of clubs is a card and card rhymes with tard.
Oi! Fix your mince pies on the jack of clubs who spilled a britney on his adams.
by Capt. Spankee Magoo June 22, 2009
1 more definition
An idiot, someone who does something stupid that annoys you.
'What are you doing! You jack of clubs!'
by El Chadders October 03, 2007