Feeling you get the morning after throwing up/ falling over/ talking to the wall about the universe being made out of segments on account on having over-indulged in the drug ketamine.
I thought I threw up on my front doorstep last night, but when I came round I realised it was my flatmate's bed. Major regretamine.
by Maryapple May 07, 2009
like forgetamine, another word for Ketamine, the drug. A strong narcotic, ketamine use can develop slight feelings of paranoia or a sense of regret.
by theoriginalMax May 13, 2007
When you've been out on the sesh to hard and you wake up the following morning with regretamine from all the drugs you took the previous night.
by KeyllyeK September 27, 2017