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The combination of the two most disgusting substances, menstrual blood (PERIod) and shit (pOOP).
"Dude did you see the toilet in the second stall? It was clogged with so much perioop I almost vommed all over the floor!"

"EW this perioop was the worst thing I ever saw AND smelled!"
Perioop by theclitnextdoor March 23, 2011

periodong 

blood on a mans penis (dong) after intercourse due to a woman being on her period
damnn, the sex last night was so good we didn't even realize she was on her period until i noticed my periodong

i was freaking out at the blood on my dick until i realized it was just periodong

i dont mind periodong- yeah its messy, but at least i know my girlfriends not pregnant
periodong by periodingdong May 11, 2016

perionoia 

The kind of paranoia one experiences on their period.
I'll forgive you for your perionoia
perionoia by Lovisini March 16, 2021
a more intense version of the word “period”
Beth: “Damn this bitch won’t keep my name outta her mouth.”
Me: “She needs to mind her business, PERIOT!”
periot by panyo May 13, 2019

periottt 

When I really agree with someone , or u want to get the point straight across
Girl 1: I hate that guy cause he cheated on me

Girl 2: periottt!!!
periottt by Glorea December 6, 2020

Periodover 

If you thought your period was going away well be wrong cause life is unfair.
The felling when your symptoms are too much so you are drunk and the next morning you will feel like complete shit but you shit yourself with blood!
"I'm totally going to have a periodover tomorrow"