to navigate through an overly crowded hallway by walking close behind a bigger person, or one that is able to get through the crowd easier.
Guy 1: Dang, looks like gym class just ended.
Guy 2: Yep. Good thing there's Carl. We can go hallway drafting off of him.
Carl: 'Scuse me..need a little room..
Guy 1: He really worked up a sweat :P.
When you're walking in the hall behind someone and you get into the awkward situation of trying to decide when to pass them and to what side.
"Dude i was so hallway drafting this fat girl in school. She smelled terrible."
"I wish there weren't so many hallway drafters at our school. They really piss me off."