The "Meat Bucket Challenge", sometimes called the "Meatspace Fantasy Beef Draft with Beer", is an activity involving dumping a bucket of meat in someone's cooler to promote awareness of beef or pork, and encourage "donations" to "research". It went viral on social media during July-August 2014.
Source: Wikipedia
The challenge dares nominated participants to be filmed having a bucket of meat poured into their coolers. A common stipulation is that nominated participants have 24 hours to comply or forfeit their share of the meat to hungrier participants.