On the occassion that you are pissed off, or just
horny, at or for another
dude, you pull out your genitalia, and slap them against any part of the body of said
dude. Loud yelling of "MEATBLAST!" must follow, and a joyful dance symbolizing your superiority over them.
I was taking a hot soapy shower with
Brian Silvercock, and he bent over to wash off the shampoo, and I meatblasted his bare back. My
friends, who were also in the shower, gave me a high
five... No Homo!