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1. slang A party at which the primary focus is the drinking of beer served from a keg. Hey, Tommy and the boys are throwing a kegger on Saturday. You want to come? The frat got busted for giving booze to freshmen at one of their keggers.
2. slang A keg (of beer). Why don't we buy a kegger to have at the barbecue? It'll probably be less money and hassle than having a bunch of bottles and cans. The criminals robbed the bar's cash register and made off with three keggers of beer.
See also: kegger