look up any word, like the eiffel tower:
 
1.
A greeting used to bid tiding to an attractive girl. Can also be used as a greeting to a man, either stranger or friend. Note that using this greeting at a man does not indicate homosexuality, but rather an example of how cool you truly are by showing that you do not give a fuck.
As said to a girl you pass on the street: "Sup girl!?"

Can also be used with a qualifing descriptor to highlight one particular girl out of a group: "Sup girl...........on the left"
by Eric of AMV July 14, 2007
 
2.
when you dont know whats wrong with your friend, you just look and them and say sup girl? and then look upset
sup girl? =(
girl: FUCK OFF, I'M EMO.
by bendoverisfit January 25, 2008