A hall crawl is a drinking contest in which several teams are made to go to different rooms all along a hallway, each room dedicated to a different kind of liquor. The hall crawl is so named because by the end of the competition most of the participants are so inebriated that they are incapable of walking, and must crawl down the hall to the next room. Hall crawls are a frequent fraternity occurrence.
"Dude, did you go the Beta hall crawl last night?"
"No, what happened?"
"Brandon couldn't tell where he was going and crawled off the balcony. He only made it through three rooms, though, so we left him there until we finished."
"...That's fucked up."