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1.
To come down with the flu.

The term originates in the US mid-south, possibly in Arkansas or Tennessee. It is a supposed combination of the words "flu" and "flown". To "flune away" is to recover from the flu.
"I'm afraid he flune."
"I'm sorry, you've flune"
"He gonna be flune for a week or more."
"They flune him at work so he gonna call in sick today."
"He flune away!"
"I hope I don't flune!"
by Pimped-pot Spaceman September 27, 2011