to thwart one's plans, bugger up, jinx, render not-on by foolish actions.
Geoff put the kaibosh on the timely delivery of his new blue Audi S5 by tying it to a win by the NSW Blues. A blue car for a blue win, he said unwisely.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug