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A silly way to mix the first letter of a last name with a Greek letter. Only people with last names starting with 'Ga' think it sounds cool.
My cousin's G-Delta is 'Ga-Pi' and he thinks it makes him sound smart.
I tried to be a G-Delta once. It was 'Ga-Omega' and it sounded like I failed a math test.
My teacher called me 'Ga-Lambda' and I didn't even know what that meant.