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Short for cohabitant, it denotes a person you live with who you're in a sexual relationship with. Way shorter than "domestic partner" or "significant other", and more grown-up than boyfriend or girlfriend, which sound so grade school. It's unisex, without being degrading to either gender, and works across any sexual orientation.
Guy to another guy, pointing at his woman: "She's my cohab."
by hunter112 December 15, 2011
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