It is from Crash Course US history. It is at around 30 second. Here is the context:
Mr. Green, Mr. Green, if it is really that simple, I am so getting an A in this class.
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Kindly note: in the past 15 years, more or less, so has started being used in place of "very much".
I will very much [so] be getting an A in this class.
He is very much [so] going tonight. [meaning: he is very much going tonight]
Nowadays, "so", an adverb (not when it is a conjunction or used to start speaking),is used to emphasize verbs. Some of this is traditional:I so want to go. [I want to go so much.]
But, when it precedes a verb as in "so going tonight"; "so doing that"; so liking this", that use is not traditional and young people use it all the time. It would be considered informal register.
It is a colloquialism used by "the younger generation". You won't hear grandma and grandpa saying it.
You are so getting into trouble for that!
Emphasis on so.
You are going to get into trouble "big-time" for doing that.