Being in a state of Happiness becuase Something good happens in a brief moment. Similar to "Buzzin'", "Bummin'", "Hummin'".
Dan: You seen Mark?
Jamie: Yeh he is Raj'in on a new PC game
Me: ohhh i know the one
bummin' buzzin' hummin' Gettin' Shirty Buzz
A state of happiness often caused by being around good friends or drinking a good quantity of alcohol.
last night I was Raj'in! I worked my way through a crate or two and hummed on the dance floor, I was steamin'.