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1.
refers to the act of eating a girls ass. Assholes always taste like blue bag doritos.

Her pussy was sore, so I blue bagged her and we called it even
by John V Doo Doo February 20, 2009
 
2.
when you get hit in the ballsack so hard that it turns blue

often happens while attempting scateboard tricks
holy shit that guy just bluebagged himself >_<
by Logz0r March 15, 2004
 
3.
A phrase used to represent a carry out from the local off licence. I believe I started this phenomenon.
"Are you getting a Blue bag for tonight?"
by Andy Mc Parland September 05, 2006