Use (one's) noodle old-fashioned informal slang verb phrase
To use one's own intelligence
A:"I can't solve this Math problem." B:"It's not tough. Use your noodle!"
You should use your noodle to find a solution to this problem.
Used to describe a person who is smart, clever or intelligent
A young person who is very clever and successful.
Wise or intelligent poeple think alike or have the same ideas
1. Lit. Very sharp.
2. Very smart.
A brilliant idea or thought.
The verb “use" should be conjugated according to its tense.
The "noodle" has meant the human head since the mid-18th century. The derivation of the word is not known for sure, but it probably came from the word ‘noddle’ originally meaning ‘back of the head’ in the 15th century and which then becoming a humorous colloquialism for just ‘head’ in the 16th century. But ‘noodle’ as we use it figuratively today means not just the physical head, but intelligence, brains, the mind, and intellect, only came into its own in the 20th century.