I looked it up and read through the NIH paper that did a review of available information about it. It's essentially a recreational drug that can be formed in your body when you take methylphenidate and alcohol at the same time.
I will put out this caution though: there were a lot of reports of bad trips, worsened focus/cognition, dangerous side effects like increased heart rate and body temperature, and there was a very high rate of addictive responses. So it may sound like fun, but you're running the risk of causing yourself a lot of problems and using Ethylphenidate (or methylphenidate plus alcohol) may make your regular ADHD meds less effective and lead into addiction problems.
I'm repeating my reply to someone else in the thread so hopefully more people can see it:
TL;DR: This is a dangerous, bad idea and as a medical student with a decent understanding of pharmacology, I do NOT recommend doing this.