someone or something abnormal, uncoodernated and silly. probably incabable of doing simple actions like thorwing a ball or just walking without making a fool of themsleves.
walking into a wall and then appolagising to the wall
tripping over nothing but air
falling up the stairs
thinking emus are soon going to take over the world
in reaction to any of these happening onlookers would say: what a gumby!
Naomi she is the biggest gumby ever
she walks into walls and appolagises to them then falls down the stairs and faceplants it, she is the gumby