n. one's female friend. (This sense in addition to the Standard English meaning that includes steady date, female lover, etc. A term of address primarily between females.) : Look, girlfriend, you can't let him treat you like that!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Example sentences from the web
In early scripts, she was a sort of girlfriend for eric while he was in paris.
Kitten is the spoiled daughter of killer moth and the girlfriend of the mutant fang.