m. Period 

When a man has a sudden burst of anger for no apparent reason

oh crap hes on his m. period

m. Period by man period April 19, 2018

I'm on my period 

a girl's excuse for everything.. and it works.

Teacher: Excuse me, why are you late to class?
Girl: I'm on my period.

Boyfriend: Why don't you want to have sex with me?
Girlfriend: I'm on my period.

Bitchy friend: Oh my god why are you eating so much?
Girl: I'm on my period.

etc.

I'm on my period by rayrayg March 24, 2012

I’m on my period 

An excuse for females to get out of doing anything, and to be extremely mean, nagging, and demanding.

I can’t go to the beach I’m on my period.

I’m on my period by Itsmesogivememoney January 3, 2019