ChatGPT warned me that you should not try this at home.
ChatGPT:
Yes, it is possible to become intoxicated, or even severely intoxicated, by inserting alcohol into the rectum. This is because alcohol absorbed through the rectal membranes bypasses the stomach and liver's initial metabolic processes (the "first-pass metabolism"), which normally helps break down and filter out some of the alcohol before it enters the bloodstream. As a result, the alcohol is absorbed directly into the bloodstream, leading to a more rapid and intense effect.

This method can be extremely dangerous. Since the body doesn’t metabolize any of the alcohol before it enters the bloodstream, even a small amount can lead to alcohol poisoning.