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when a guy jacks off so much he smells like a sweaty gym sock in a landfill and doesn't care because he's too busy thinking about pizza and porn.
My brother gacked off for three days straight. He looked like he'd been buried in a cheeseburger and a trash can.
I saw my neighbor through his window. He was doing the 'gacking off' thing and screaming at a chicken nugget.
My dad gacked off so much he forgot to pay the bill for his internet. Now he's watching cat videos on a phone that doesn't work.