mad yeahs
a loud and proud way of saying you're totally cool and completely happy with something that was absolutely amazing.
When my friend got a new video game, I said, 'Mad yeahs!' and then played it for six hours.
I saw my favorite band and said, 'Mad yeahs!' and then cried like a baby.
After I got my first paycheck, I said, 'Mad yeahs!' and then bought three pizzas.