1 definition by Garreth Hughes
To intake large amount of illegal narcotics, traditionally marijuana. To cain means to go above and beyond normal intakes to the amount that will physically challenge you and to do it at a fast pace.
"Jordan cains like a muvaf*ck"
"Right lads facny a caining session?"
"Ben was well cained, puking up solid jelly babies....."
"Right lads facny a caining session?"
"Ben was well cained, puking up solid jelly babies....."
by Garreth Hughes May 27, 2004