n. (one's) head. : Put your hat on your noodle, and let's go.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
noodle (v.)
"improvised music" (n.), 1926, probably from noodle (n.), on analogy of the suppleness of the food and that of the trills and improvised phrases. The verb is first attested 1937 (implied in noodling).