Definition: Really, Dad, I'm serious.
Usage: 6 or more times per day, to emphasize important points:
"There was this HUGE wave, it was about 10 feet high--LITERALLY."
"I haven't eaten at McDonald's in about three years--LITERALLY."
"I hate riding in rental cars. They're worse than taxi cabs. They make me throw up--LITERALLY." (Editor's note: Confirmed.)