To all the middle-age announcers out there: when you see a fan making a hand gesture you don't understand, you shouldn't ask your broadcast partner to explain it. It just might be a blowjob pantomime.
James writes in to tell us that he's the subject of the video. After being bumped up to the good seats in a snow-emptied Prudential Center, he "was talking to [his] friend about a video [he] saw online of hockey fans who taunt the opposing teams' players by doing that when they are along the boards." Meta.
(Thanks to Steve and Robin for the video.)