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A SGF does not let his girlfriends make poor decisions especially when the sitution involves a guy.
by Gracie_Adler March 16, 2010
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secret girlfriend, a girl from a couple who don't want to reveal their relationship
boy: I like you!
girl : if my parents find out it could be very embarrassing!
boy : I guess your my sgf then..
by Nebkiwi May 10, 2008
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