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2.
The act of launching a land vehicle, landing it right side up while being intact, and losing total control over where it goes. (Losing total control includes having unexpected outside forces causing a major change in motion.)
WOAH, his Jeep was pulling a Halo!
by Rouge Medic October 23, 2011
 
1.
The act of randomly falling asleep while in the middle of an an activity; usually while chatting, voice chatting, or playing an MMORPG.
"Oh man, our healer is just standing there! I think she's pulling a halo again!"
by Shinikaru January 09, 2008