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1.
Another derogatory term for ketamine. specifically denotes a k sesh that results in embarrassment or regret.
"Bobby mate how'd you get all those fag burns on your face??"
"errrr.....that'll be the regretamin"
door mandingo89 25 juli 2009
 
2.
Doing lots of ketermine and popping in and out of the hole aggresivelly.
Phil " I managed to turf through a whole gram of the mine last night on my own, dude am i regretamine'ing this
door JRF17 12 december 2010
 
3.
Ketamin, your super cool friends who do Ketamin most weekends but ALWAYS complain about the comedowns etc afterwards but are complete and utter fucking idiots and do it again with the next day saying the same thing, doing the same thing, you guys get old and boring real fucking fast.
Stupid fucked up space cadet that will work a shit job for the rest of their lives: Im going to do Ketamin again tommorow.

Normal person: Dont you mean Regretamin you fucking dolt cunt stain faggot.
door Captain i shit the bed 23 oktober 2007