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1.
The act of changing one's gear to look like another piece of gear in World of Warcraft. Gamer abbreviation for "transmogrifying."
Yes, I finally got my tier 2 helm from Nefarian! BRB, mogging my tier 11 headpiece.

Hey, are you seriously planning on mogging Thunderfury with a Rockhide Strongfish?
by racheltoast August 28, 2011
 
2.
(v) The act of sitting down on the stomach of a deceased young female by a 'moggee,' where the decaying internal matter is shot out of her vagina into the mogger's mouth. If the decaying matter is subsequently swallowed, it becomes a "mogg supreme"
The sandwich was so bad, it tasted like mogging during a rainy, 90-degree day.

or

My friend and I had some spicy hot wings and went mogging to wash it all down.
by Horrid McHorridson April 29, 2005
 
3.
Mogging:- A sexual practice, where by the moggee ejaculates (or spaff's) in to the palm of his hand and the offers the hand to his partner (the mogger) like one would offer a saucer of milk to a cat (or moggie!). The mogger then laps at the hand full of ejaculate until fully consumed. The moggee should encourage the mogger by stroking the back of their head and making feline noises such as purring or meowing.
That bitch just loves too drink cum, so we tried mogging. She lapped up every last bit!
by BEW Crew April 10, 2007
 
4.
Mogging:- A sexual practice, where by the moggee ejaculates (or spaff's) in to the palm of his hand and the offers the hand to his partner (the mogger) like one would offer a saucer of milk to a cat (or moggie!). The mogger the laps at the hand full of ejaculate until fully consumed. The moggee should encourage the mogger by stroking the back of their head and making feline noises such as purring or meowing.
That bitch just loves too drink cum, so we tried mogging. She lapped up every last bit!
by BirdsEyeCrew March 29, 2007