A vegetable of very limited intelligence. Like George W. Bush, only smarter - a turnip knows enough to keep its mouth shut. Bush is continually flapping his. You will rarely catch a turnip saying things like:

"I just want you to know that, when we talk about war, we're really talking about peace."

or

"I hope you leave here and walk out and say, 'What did he say?'"

When one turpin is insulting another turnip, he will call him a bush. It's all horticulture really when you think about it...

A person being extremely random.
Being random.
People are often being very turnip on the in-tar-web.
Changing subject to something different when talking.

a person in a permanent or persistent vegetative state or coma

A word used to described something stupid, boring, or just plain retarded. It can be used to call someone stupid.

Function: noun
Etymology: probably from 1turn + neep; from the well-rounded root
1 a : either of two biennial herbs of the mustard family with thick edible roots: (1) : one (Brassica rapa rapifera) with usually flattened roots and leaves that are cooked as a vegetable (2) : RUTABAGA b : the root of a turnip
2 : a large pocket watch

Large feces
also used to describe something that is horrible, of no use or plain no good.

Derogatory name for a Bristol City supporter.
As thick as the root vegetable, has nothing useful to say and as interesting as digging one out of the ground!