Sixth gear is a state of mind when there are no worries, no problems and no concerns. The phrase has been made popular by Kenny Chesney
and Jimmy Buffett
I can't wait til this summer when I'm gonna head down to Cozumel, throw it into sixth gear, and let it ride.
Rawnamugg is another term for being ridiculously drunk. It's in fact very close to the point of blackout but still coherent enough to eat 12 tacos.
I can't wait til Friday night. I'm gonna get rawnamugg and try and score some pussy.