poka
If you don't count surgery, probably reaching up a cows rectum.
It is called an enema.
Rectum? Probably not; the rectum is inside the body, and you probably couldn't get to it. The anus? The anus is the ring of muscle that is the exit from the rectum. If he/she maintains some basic hygiene and cleanliness, and isn't ill with ebola or cholera or dysentery, it's probably safe to do. Kinky, perhaps, but safe.
Put a condom on your tongue on cut it open and put the cut up condom over the rectum. You do not want fecal bacteria in your mouth.
up your rectum
A frog's rectum takes bacon and poops it on you and then hops up your butt and strangles your 2345678.
Putting a mint up your bum can cause irritation or a burning sensation due to the menthol in the mint. It can also disrupt the natural pH balance of the rectum and potentially cause inflammation. It is not recommended to insert foreign objects into the rectum as it can lead to serious infections or injuries.
Colonoscopy procedures look at the areas of the rectum and large intestine, as well as the colon. They put a scope up inside you so they can see what they are doing up there.
Up my rectum
No, it is not safe to put a spoon up your butt. The rectum is a delicate area with sensitive tissues that can easily be damaged or injured by inserting foreign objects. This can lead to serious health risks such as bleeding, infection, or perforation of the rectum. It is important to always use caution and common sense when considering any kind of insertion into the body.
The meniscus
The one your poop comes out of. But it is called an anus, not a rectum. The rectum is up inside you.