It's actually a cricket term relating to a certain strategy of concentrating fielders in an arc between silly mid-off and deep long-off. This is advantageous against batsmen who are weak on the cover drive and have a poor off-side game. The off-kilter trap was famously used by the great West Indies team of the late 1970s to upset the rhythm of Indian master I. Khan Singh. His failure to produce any fluent batting right up to the whitewash at Georgetown led him to storm out of the post-match press conference, declaring 'Off-kilter? I'll give you rum-sucking reggae monkeys off-kilter!' as he launched an unripe coconut with a hook shot over the Barbados Cricket Club Members Bar. It was a grand moment, despite the impending destruction of the one working traffic light on the island.