A term used to describe the male counterpart to female bitchiness and impatience during menstruation. When men get very grouchy or persnickety about certain things, they are said to be on their butt period.
Ricardo: *Touches iPhone*
Austeen: GUYS, DO NOT TOUCH MY FUCKING STUFF. YOU CAN PICK ON ME, JUST DON'T TOUCH MY STUFF! YOU CROSSED A LINE!
Ricardo: Uh-oh, Austeen is on his butt period!
by Larry Finster April 12, 2011
When you take something in the butt and the shits you take for the next several days tear your asshole causing anal bleeding.
"Cool, he stuck his finger in my butt last night and now I have my butt period!"

"That fucking sucks bro!"
by Meowzers420 March 02, 2014
when you bleed out of your butt becuase youre mad/angry/upset. also see pop her cherry.
evan o connor had his butt period when kaki dumped him
by Ian18924 October 13, 2005

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