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1.
Extension of baines, used to describe someone who achieves something legitimate.
Guy 1: "Did you hear about Sam?"

Guy 2: "No, what's he done this time?"
Guy 1: "He only went and hit the gym early this morning, smashed out a 130kg bench and then hit the libes for 6 hours to get some savage work done before tonight."
Guy 2: "Fuck me, that guy is such a bainer!"
by legitabainer April 22, 2012
 
2.
A slang word used in Dorset for cigarette.
"spin us a bainer"
"can i chav a bainer?"
by Lawrence Baker December 16, 2005