A way of describing an ambiguous relationship between a man (or woman) and another woman. The individuals have sex, and have a close personal relationship, but the woman in question is not defined by her lover as a girlfriend, so she can only be referred to as a 'girl thing'.
person 1: what's up with chris and laura, they live and sleep together, are they going out?
person 2: no, she's just his girl thing.
Are they friends with benefits? Are they in an open relationship? We don't know, so we'll call her a girl thing.
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