The act of cupping one's hand around the asshole, with or without pants on. Then farting into the cupped hand, leaving it for a second to gather the gases and finally throwing it into a victim's face.
Melissa: Why would a guy want to jack off instead of having sex with his significant other?
Mike: It's not that guys would prefer to jack off. Think of it this way: Some times, you just don't have a lot of time, but ya got needs, right? You'd prefer to sit down to a nice full meal, but when you have 20 minutes to shower, eat, and get to work, you can throw back a Hot Pocket in 2 or 3 minutes. It's not the ideal meal, but it's the most convenient when you're too rushed or lazy for a full meal.