A term used by women to dismiss men when they are sick. Even though there is evidence to suggest that viral infections in men may be more severe than in women.
Becky: My boyfriend doesn't want to go shopping with me because he's sick
John: That sounds reasonable
Becky: No it isn't. He's not really sick, he just has man flu and wants attention!
by Flobsmack August 21, 2023
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When you spouse gets sick on Friday so you have to watch the kids all weekend. Usually last two days.
I hope my wife doesn't get Friday Flu again, I want to play golf.
by Herod apyur pupir February 24, 2017
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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
by big booty ho's January 23, 2017
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Going out and drinking Exssesive amount of alcohol in a short period of time.
by Student flu April 20, 2015
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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."
by Andymius September 26, 2014
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