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An eager person, usually with a nerdish edge to their enthusiasm.
"Hammy was already on my doorstep when I got home from work, even tho the show's not 'til 9. Brah's a keen bean."

"Jennifer's such a keen bean she ducked out of the New Year's party early to get a head start on her tax return."
by SeaBat June 09, 2006
A response with no actual meaning to anything that can be said. The more neutral form of "cool beans". Simmer until hot.
Not to be confused with a keen bean or talking toaster ovens.
Keen beans
by mrsticky005 May 29, 2010