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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
 
15.
Mandatory hell. Cause of penis envy.
if you dont like it, men, go fuck yourselves.
by Erin February 19, 2005
 
16.
when a woman bleeds from her happy hole

takes up a stupid length of a womans life.

glad im not female.
"urgh. whats that? why's your body bleeding? from that hole? that's not fun at all!"
by lordblunkey May 14, 2005
 
18.
The menstruation cycle happens once a month every 27-30 days. Tiny cells that get fertilized when you are pregnant, come out of your body in a blood like form because when they enter your uterus they collect a lot of blood and then leave the body. This occurs because the body produces eggs so you can get pregnant, but when they are not being used they leave the body, therefore you get your period once a month. Some girls can get their period from age 9-18. Side-effects include; bloating, cramps, fatigue, vomitting, and others.
I got my period this morning, and my stomache kills like fuck.
by Melissa Ann x3 September 15, 2005
 
19.
A time a woman's vagina bleeds. It's annoying to both males and females.

Will often cause a girl to go from calm and sane (well, at least as calm and sane as a girl can get) to violent, batshit insane and irrational.

Note to all guys: Stay the fuck away from a girl on her period unless you like getting hulk smashed 20 feet below the ground.
"Jenny is on her period."
"Yeah?"
"Yeah. I'm now missing 7 teeth and an eyeball."
by rico567 June 29, 2009
 
20.
They suck.
Commas rule.
"Because periods suck!

And commas rule!

This is Sex Education, not grammar fool!"

-I Set My Friends on Fire & Smosh
by Atlas15 May 10, 2010
 
21.
A natural cycle that occurs within the female body every 26-30 days. Each month, an egg travels from the ovaries into the uterus, waiting for fertilisation. A lining of blood, tissue and mucus is built up during the month as a support for a embryo. If the egg is not fertilised, the linging will break down and, along with egg, will be flushed out the vagina for a duration of 3-9 days.
Bloating, cramping and mood-swings are sings of PMS/PMT.
'I got my first period today.'
by deranged December 31, 2005