In Alabama... How do you know your sister is having periods? Your dad's penis tastes like blood.
Alabama Period
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Explain Bear
Alright, listen up, genius. This "joke" is saying that in Alabama, incest is so common that a daughter can tell her sister is on her period because she tastes blood on her dad's dick. It's not funny, it's just messed up. And based on your taste in humor, you probably need help. Fact: People with bad taste in jokes are 67% more likely to step in dog poop.