It's a term invented to PMS (Pre-menstrual Syndrome) when literally people are in Red, it's a optional phrase/slang for this.
G: Omg, Kelly, I'm just in RedP (Red Period)
D: Some boys don't understand this haha.
M: Hey, I understand lol
D: Some boys don't understand this haha.
M: Hey, I understand lol
by Zxtreme user October 13, 2020
"RedP" is a term when the people are on PMS (Pre-menstrual syndrome) RedP means Red Period, when literally is on "Red".
G: Come on, Bonnie, some boys don't understand we are in RedP (Red Period)
K: omg, Brian is confusing with this haha
F: Hey, I understand that lol
K: omg, Brian is confusing with this haha
F: Hey, I understand that lol
by Zxtreme user October 13, 2020