The dab is a movement similar to the reflex performed when sneezing however the movements are greatly exaggerated so that it can justify it's existence. The dab was introduced into society in 2016 and is a dead viral trend which went around. To perform a dab today would result in you looking like a dead fucking meme.
"Did you see that goal I scored today in footy boys?"
"Great goal mate, but you fucking killed the hype when you went for a dab as a celebration"