a term popularized by Samuel L. Jackson in snakes on a pane
Enough is Enough I've had it with these muthafuckin snakes on this muthfuckin plane.
by applealex December 3, 2009
something a white kid says before he pulls out the AK out of his backpack
James: Sammy you're a faggot
Sammy: James Enough is Enough
*Sammy reaches into his backpack*
by Dolphin_Nigga July 11, 2016
The premise that if an underage girl is old enough to count, she is old enough to have sex with. In most countries though, acting upon this notion constitutes as statutory rape.
"Hey check out that babe over there, she's totally giving me the eye."
"Yeah but she's only like 7 years old"
"Hey man, old enough to count, old enough to mount."
by Lars Blackman October 15, 2011
just a funny saying. only to be used at th.e right time.
how bout, old enough to shit old enough to hit
by Diggitty March 8, 2011
A phrase, usually used to be crude, indicating the age by which a girl should be having sex. "Old enough to bleed" refers to the age a girl begins menstruation, usually around 12, but can be between 8 and 16 years of age. "Old enough to breed" means that when she mensrtruates she can have children, but of course she can not have children unless she has sexual intercourse.

Another way to rephrase this is "if she has started getting her period, she is old enough to have sex". Of course in many cultures, a girl is usually under the age of consent when she begins her period, so the result could be statuory rape. However, the female body begins menstruation earlier than the age of consent because years and years ago, humans did not live long, so it was necessary for the survival of the the species. For example, during the Roman Empire, the average life expectancy was 22 years.

Pheromones released during ovulation attract males to females who are able to bare children and cause them to become erect and desire intercourse with the ovulating female, so before civilization imposed restrictions on human sexuality, females would become sexually active when the began ovulating. While this is not a justification to have sex with underaged girls, it does explain why human females are able to have children long before society permits them to have sex.

At face value, the phrase states the obvious truth that once she begins menstruation, she can begin to have children, but as stated above, this is not how the phrases is commonly used.
Overheard at a junior high school party:

"I can't believe you went all the way with Sally, she's only 12!"

"Yeah, well, you know what they say... 'old enough to bleed, old enough to breed'. She was hot and horny too, you know."
by BRD February 24, 2006
A cruder variation of old enough to bleed old enough to breed. The use of the word butcher over breed gives the whole phrase a double meaning (the reference being to abattoirs)
A: Wow, I'd give her the time!
B: She's too young...
A: You know what they say: old enough to bleed, old enough to butcher!
by Guy June 16, 2006