A robot that is either; a)hideous in nature or appearance; or b)not working properly. Malfunctioning.
That ugly silver thing you got to vacuum the floor, is a total grimbot.

An example would be the robot from Lost In Space.
by Napedog November 08, 2011
A friendly but unfortunately hideous looking creature.

N.B. NOT to be mistaken with the Majnemer

Also know as Grimbibbles.
Look at that Grimbot! He camouflages so well in that pile of dung!
by The Grimbmaster January 20, 2011

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