When you drink alcohol through your mouth, you metabolize it and process it through your liver and other organs. However, when you deliver it through your rectum, you absorb it directly into your circulatory system, rather than processing and metabolizing it. Therefore, delivering about a shot's worth of hard alcohol rectally may be equivalent to 10 shots taken orally once it gets in your blood stream directly. Moreover, a rectal delivery system, unlike an oral one, has no safeguards against poisoning, such as the ability to vomit up the offending toxins.
If you're young and healthy, then you have no reason to take alcohol this way. The kind of buzz you get from alcohol enemas is the same kind of buzz you get from drinking, except with far more danger. And, if you simply really like enemas, there are many substances other than alcohol that klismaphiliacs (people who find sexual pleasure in enemas) can use.
As with all alcohol consumption, remember that intoxication impairs your judgment and puts you at risk for unwanted and unsafe sexual activities. While the burden of evidence weighs against attempting this, if you decide to try boozing this way, make sure you do it in a safe space (obviously, far off campus) and among supportive friends.
Great care must be taken as to the amount of alcohol used. Only a small amount is needed as the intestine absorbs the alcohol quicker than the stomach. Deaths have resulted due to alcohol poisoning via enema.