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1.
Someone who has either made an idiot of him/herself or is known for doing so. Also can be used to describe someone slow of wit.
Did you see Jason skin his arm falling off his skateboard again? What a geener!

Oh My God, that retard losing on Jeopardy is such a geener.
by Emilee M May 17, 2005
 
2.
Teachers pet, never skips school, reports "bad" student, always does homework, sucks up, always puts hand up, etc
Person1: Teacher! Teacher! I can answer that question!
Person2: Johnny is such a geener!
by Toyzzz June 19, 2009