use (one's) noggin

To use one's own intelligence and intellectual ability; to think logically and rationally. ("Noggin" here is slang for head or brain. Often said as an imperative.) Come on, Dean, I know you can figure this out on your own. Use your noggin for a change! I can't believe you were arrested for selling marijuana. What were you thinking? Why don't you use your noggin once in a while?

Common Names:

Name	Pronounced	Usage
Tena	TE-nah	Croatian
Sung-Jin	sung-jeen	Korean
Gertie	GUR-tee (English), KHER-tee (Dutch)	English, Dutch
Lexa	LEKS-ə	English
'Asenat	-	Biblical Hebrew
Valerie	['væləri]