Cockney rhyming slang for Shit (cack, poo, crap, turd)
Derived from ghastly team uniform of a very poor quality soccer team in the English Premier League called Tottenham Hotspurs a.k.a Spurs.
There is no way I’m taking that job, it’s Spurs Kit.
Woman: Do you like this dress?
Man: No, my darling. I'm afraid it is Spurs Kit.