UI

see Useful Idiot

Those clowns at MSNBC sure are UIs for the commies.

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UI

Stands for Useful Idiot. Refers to ardent adherents of a cause who do not understand the cause and are then manipulated by the leaders of the cause into doing whatever the leader wants.

"Don't worry, that reporter is just a UI."
"He may look like a Congressman, but he is really just a UI.