Well, like a gimp but worse. It means as well as being a fool, retarded and just plain stupid, everyone knows it except you and you keep on believing your soooooo good BUT YOU'RE NOT!!
She's such a gimboid. Thoses shoes were cool maybe IN THE 70s!!!
Insult that was made relatively popular in England through it's use in the TV comedy series Red Dwarf. Essentially means a fool. See also numpty and prick.
"You utter, utter gimboid. Go stab yourself."