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.
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