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1.
retard dork hillbilly idiot Kevin
Guy with a Southern mentality, kind of slow not too bright. A stupid or silly person; a dolt.
A person whose mental acumen is well below par.
A person of moderate to severe mental retardation having a mental age of from three to seven years and generally being capable of some degree of communication and performance of simple tasks under supervision. The term belongs to a classification system no longer in use and is now considered offensive. Also in the cartoon Tom and Jerry, uncle Pecos sings a song about a cram bone! Nobody really knows where the hell this word came from, but if you ever met someone that said something soo stupid, you would say what a cram bone!
Oh my God, this guy Kevin in my office went on the Master Cleanser diet and didn't eat anything for like 10 days and almost killed himself!...What a cram bone.

Cram bone, cram bone eats chicken and beans!!!

by brian the great April 07, 2006
 
2.
To take the last of the coffee and not make any more for your coworkers. Describes the mix of frustration, anger, and resignation as you look at your cream ("cram") filled coffee mug while hefting the bone-dry ("bone") empty pot.
"Aw, man! I really wanted some coffee, but John cramboned me." "I was going to make more coffee but I was in a hurry, so I just cramboned everyone."
by Medesha April 04, 2009