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10.
the time when blood and liquid flows out of the vagina, starts between age of 12-16 for most girls, some later, earlier.

Don't DARE to talk about this to your girlfriend
Her period began last week
by 7 Train January 27, 2004
 
36.
A small dot used to signify the end of a sentance. Often neglected by poor typists and gamers.
In that whole post, you only had one period, idiot.
by Hydra August 09, 2003
 
37.
Mr. T's middle name
"First name, Mr. Middle name, period. Last name, T."
by gdihtdriurtd March 04, 2009
 
38.
Hell
Man 1: Man my girlfriend just broke a frame, cried about it, hit me when i laughed, chased me outside, locked me out, threw my stuff (half of it broken) out the window, cussed me....
Man 2: sooooo.... she's on her period?
Man 1: Ya....
by Commander Scoob May 28, 2010
 
39.
Time taken to complete one cycle, this can vary depending on the phenomenon under observation. Symbolised by T.
Dude 1 - Dude, Alex's period continued for a longer period than usual this month.
Dude 2 - How much longer?
Dude 1 - It took 9 days.
Dude2 - That would have sucked donkey balls.
Dude 1 - Surely did.
Dude 2 - Yeah, its a shame she is still a bitch for the period between her period (approximately 1 month)
Dude 1 - Yeah, too true.
by Scuzzbutt August 18, 2010
 
40.
A monthly dose of bitch
Guy: Hey
Girl: DONT FUCK WITH ME I'M ON MY PERIOD
by crazylady112 March 04, 2011
 
41.
1: a specified amount of time
2: a window of time that a woman experiences agony in their unchartered territory and can last long, usually noticed by blood stains because the vagina is leaking blood

3: ... a dot terminating the sentence
1: there's only a period of time before some strange thing happens
2: Why is there blood coming out of me? i did not cout myself... oh shit... my period... ... ... ...AUGHHHH!!!
3: WHY THE FUCK DO I NEED TO EXPLAIN THAT A PERIOD IS A SIMPLE DOT!?!
by your best idiot April 14, 2010
 
42.
1.Monthly flow of blood in females.
2.THAT'S IT... END ..full stop
3.Speach or Class lecture
1. Aeyo gal You smell shit.. You on your periods?
2. You punk ass bitch I hate you Period.
3. Man I'm tired When is this period gonna end?
by Qaiser December 11, 2006