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The one guy (commonly a "bro") that is sober in a group of all drunk people. Sobero's duty is to take care of the group and make sure nothing goes wrong. It's the highest form of responsibility in a alcoholic group.
"If you ever need a sobero, Sean's the guy."

"Man, last night, I had to be the sobero in this group of maybe 20 drunk girls."

"Damn Haruko, I should have had a sobero. I lost my iPod, my cellphone and my wallet last night, while I was drunk."
by dmanlee93 March 08, 2010
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