Nothing unless there is some new religion I've never heard about, that worships the buttocks. A sect is a religious order. Perhaps you are referring to "butt sex," in which case you should check out the link.
It means they show their butt to you
Butt / Buttocks in Japanese
pain in the butt
laughing my butt crack off
a infected hair on an elephants butt. But now it can mean friend...
What does a butt mean? It is on a person. Right? What does a butt mean? It is on a person. Right?
her butt
Your butt hurts.
It means you got a cramp in your butt
It means you have an UGLY butt!
The butt of a joke is the part you laugh to death in!
your butt graduated from college
you have a nice butt and they like it.
Are you sure you don't mean toned butt? A toned butt or buns of steel are buttocks that are firm.
Butt in Japanese is futomomo [太もも]
It means he considers your butt big.
a wazoo is your butt