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8.
Etymology: Used in Al Franken's "Rush Limbaugh Is A Big Fat Idiot and Other Observations"

(n) one who blindly and uncritically agrees with everything that comes out of Rush Limbaugh's mouth

See also dittohead
The most frustrating thing about debating a didiot is that the source they cite for all their information is Rush Limbaugh, a man not known for his integrity.
by fduck January 12, 2004