One who prevents the person or persons they are hanging out with from getting free alcoholic beverages, sometimes in the form of a case of beer, from an interested suitor. The suitor refrains from delivering the beverages because they believe they would be cock blocking the case blocker.
Mary: "I was going to get shit-faced for free off of that guy's 30 pack of Bud Light, but Randy definitely case blocked me from scoring any by sitting next to me."
by SoBroItHurts February 12, 2011