A "hut" is a hand motion used when someone does something stupid or ignorant. A prime example of a hut is holding your hand like one would in a high five and point that hand at the person or thing that did something stupid. The thumb is pointing upwards and the fingers and pointing towards the target.
Austin: Yo can i have a waterslide down from my room to the pool for my birthday?
Ben: "HUT" (displays the hut motion)
Jeremy: My fantasy football team will score 250 points this weak because of Jamaal Charles
Josh: "Hut" (displays the hut motion)