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1.
To whine, cry, bitch, be a pussy etc. about something.
Not Cool Kid (to teacher): What?! I got a 99.4?? Aw miss, at least give me the 100.

Cool Kid (across the room): Quit girlin bitch and shut the fuck up.
by Moc November 21, 2007
 
2.
Another way of saying 'going on'.
Person one: Hey girl, what's girlin'?
Person two: Eh, not much. What's girlin' with you?
by girlfriend April 19, 2005