The sickness that onsets, usually on a Monday, after a weekend full of partying and doing drugs.
Calling in to work -
Partier: Boss, I got the party flu I'm not going to be in today
Boss: No problem man. I'm just getting over my party flu from last weekend. It was hardcore.
Partier: Thanks. See you tomorrow
Going out and drinking Exssesive amount of alcohol in a short period of time.
I have a sore throat due to student flu
When you think about becoming a professional, and act like one, when in turn you are actually making yourself look like a fool. Occurs commonly in young children learning to become the next hit of a certain occupation.
"That kid wants to be the president. He has the Professional Flu, ain't that odd?"
"I better stop getting the Professional Flu, otherwise i am going to make a fool out of myself."