An expression used to show great awesomeness. Its origin is unknown, even though many say it was derived from the old English word "gangster."
Example 1
Person #1: Man, we just scored in this totally g volleyball game in which everybody sucks and nobody knows how to hit the ball
Person #2: I know right. That was totally g!

Example 2
That car is so totally g!!!
by Indefatigable August 31, 2011
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means "totally not good"- used in the Super Milk Chan Show(best show right next to Magical Play)
I'm about five seconds short of throwing up! totally N. G.!!
by synthetika June 6, 2005
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McGregor ko'd Aldo in just 13 seconds. He is a total G!
by Kaiser77 June 24, 2017
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