a frequent or favorite female companion; sweetheart.
a female friend with whom a man or boy is romantically or sexually involved; sweetheart
any female friend
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Look, girlfriend, you can't let him treat you like that!]]>
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Dictionary of American Slang and Colloquial Expressions
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.
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.