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1.
A "clugger" is the stale, warm remains of a beer that populates the bottom of a can, bottle, or glass. Warmed by the hand, and lacking any meaningful carbonation, this beer is unpleasant and nauseous to drink while sober. When inebriated, the clugger becomes an odious task, which upon imbibing may be the impetus for immediate vomiting. Cluggers are not fun to drink, but people who leave half finished beers around are derided, so finishing the beer even is it is a clugger is considered good manners.
"Oh man, I almost threw up after downing that clugger."

"Yo Pete, if you don't down that clugger you're not allowed to get another beer."
by PhillyDan June 11, 2009