"Not the brightest star in the sky" means there not the smartest person.
Let's say you where in a class room and you failed a test, sombody might say well "there not the brightest star in the sky"
Did you hear that Kim failed her exams?
Well she's not the brightest star in the sky if I'm being honest.
by Xo_Xo_Xo December 30, 2020
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An analogy describing someone who is not quick-witted and gives the impression of being not very smart.

airhead dimwittedç
You are going to ask John to hook up your PS4? Good luck on that one, you do realize he's not the brightest bulb on the christmas tree.
by TheBigCanucklehead March 15, 2015
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commonly used when someone does/says something stupid.
refers to someone being more dumb then the general public or a group of people
Person 1: i never knew cows made milk
Person 2: are you kidding me, where did you think milk came from?
Person 1: I don't know

Person 2: yeah, your not the brightest kid in the cabbage patch
by the brightest kid May 11, 2011
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Them: what's 1+12?
You: 300
Them: WTF dude you stupid or summin?
You: im not the brightest tool in the shed.
Them: u a stupid hoe
by KappaKeepo123 October 29, 2015
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Lee Felix from SKZ! He's the sweetes and the purest soul in this Earth, his smile and the thousand stars on his face will definitely blinded you, put on sunglasses when you look at him <8
"Who's the person who shines brightest than the sun?"
"it's Felix!"
by -tess September 19, 2021
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