To "do a Dallas Johnson" is to pass out while drinking, then regain consciousness and continue drinking copiously. Named in honour of Melbourne Storm/Queensland State of Origin lock forward Dallas Johnson, who was knocked unconscious (and convusling) on the first tackle of the 2007 State of Origin Game 2, then returned at half time and made thirty tackles.
Luke: I'm going to drink a slab of beers in 24 hours.
(Three hours later: ten beers + Luke both gone)
Rob: The only way he will finish is by doing a Dallas Johnson.