Sweaty is a term used by 'townies' in a fatal attempt to insalt those of a allternative nature. They see some one walking down the street minding their own buisness wearing baggy jeans and a huddy and all of a sudden they smell and don't wash (even though they showerd before leaving the house!) Sorry guy's but I seriously think that you need to think of a new insalt.
Sweaty is also used to describe a person who is gaming so intensely that they have neglected to shower, shaved, changed their clothes and/or remove the pizza boxes or food surrounding their PC/computer/laptop. You can game intensely and NOT be sweaty, however, often times intense gaming and being sweaty go hand in hand.
example
1) Them GRIZZLY boys (Classic WOW guild) are some sweaty bros.
2) "Baby, I'm about to start my sweaty grind to grand marshal"-man says to his wifey as she gasps in horror as her husband is covered in body hair, pizza stains, and is surround by coke cans used to spit his dip into.