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2.
A Phrase developed by the team of 3 Sydney Rave DJ's/Promoters known as "The Bag On Boys". The "Bag" is a A4 sealable bag which contains Sydney Rave flyers and is handed out at the end of the event. The phrase "Bag On" is said to each person as they take their flyer bag.

It also has further meaning as the Highest form of compliment.
Oky: "Bag on, Happysnax 2 weeks, Mystic soon"

Exile: "Im going to Woy Woy"
Buggin: "Bag on"
by Daniel eXm Cherubini March 05, 2004
 
1.
verb:> to bag on; to call down, deride or berate a person for a poor descision or choice they have made. To insult. The lowest form of praise generally during conversation,in a group,with the subject present. Originally to place bag on; an ancient tradition whereby nomadic tribes of hunter gatherers roaming the steppe would bury an offending subject up to their neck and defecate upon their head to ensure the social order, often times the scrotum sack would be dragged across the subjects eyes. This would later be termed bagging on as in sport.
bag on,bagging on, bagged on
Hey man...I was drunk...how was I supposed t know that was a dude...stop bagging on me !!!
by Jannasauras Rex February 24, 2005