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G. S. A. L. O. means go suck a long one. It’s like telling someone to shut up but with extra attitude.
My little brother said 'I’m gonna beat you up' and I replied, 'G. S. A. L. O.!'
My mom told me to stop talking and I said, 'G. S. A. L. O.!' and walked out.
At school, my friend called me a nerd and I said, 'G. S. A. L. O.!' and he shut up for the rest of the day.