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1.
when someone usually under the age of 21 comes poorly prepared to a camping trip "without booze" and then visits another campsite and relieves them of their delicious treats and beer.
Tonight was going to be a sober night until jimmy went yogi bearing for that ice chest.
by Genitalia1371duecenine June 12, 2010
 
2.
The act of taking booze by sneaking into random backyards and going through their outdoor fridges, mini-bars, or coolers. This is done when you don't have any money to buy booze, you do not want to buy booze, or you are not old enough to buy alcohol.

Yogi- A person who searches for and takes the booze.
Boo Boo- A person who keeps watch for people who would catch you.
(There can be multiple Yogis and Boo Boos)
Guy 1 "Hey dude, we are all out of money and beer!"
Guy 2 "Let's just go Yogi-Bearing."
Guy 1 "Ok, but ill be a Boo Boo since you got us caught last time when I was the Yogi."
by fwsd June 29, 2009
 
3.
To steal a co-worker's lunch from the breakroom fridge.
I was so hungry today, I starting Yogi bearing the fridge at work.
by James Frohlich January 02, 2012
 
4.
The act of sneaking into someone's house, usually at night, through their backyard and stealing their booze. This can be done to a specific person you know, or be done house to house in a neighborhood.
"Dude, we're out of booze. Let's go Yogi Bearing around the neighborhood."
by Victor the Virile April 08, 2009