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cut someone's lunch
to make a move on somone else's girlfriend. Compare lunch cutter.
Contributor's comments: to be beaten to a particular person to date etc.; to be whiteanted; to have a prospective beau taken away from yourself: "He cut my lunch."
Contributor's comments: Where I grew up, outer western suburbs of Sydney, I often heard of someone 'cutting someone's lunch' which usually meant that a man's best mate was sleeping with his wife.