Making sure someone will not succeed or pass.
My teacher pulled a Gandalf today when he gave out a quiz that I surely "shall not pass".

The car in the other lane next to me pulled a Gandalf for about 2 miles. He made sure I wouldn't be able to pass.

Bob: Damn, that girl at the end of the bar is looking fine, I think I'm going to try and make a pass at her.
Charles: No way man, she pulled a Gandalf already on 3 other guys who tried me make a pass at her tonight.

Question: Why didn't the chicken cross the road?
Answer: Gandalf
by rockylibero October 10, 2012
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"So a doula's kind of like a vaginal Gandalf?” - Jake on Brooklyn Nine Nine - Season 3, Episode 8
by Amelsia October 6, 2019
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founded in wisconsin, the alcoholics state, the "Dripping Gandalf" is when a person is drinking a beer and they spill so it drips from their chin down to their shirt. As if the beer spill was following a beard line.
"yo Nick i like the Dripping Gandalf you pulled while flirting with those hot girls, righteous..."

"Jaci loves when i do the Dripping Gandalf on top of her ;)"
by G and the boys January 8, 2013
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Pubic hair that grows longer on the balls than the thatch on top of the penis!
Dirt Bird 1: Oh my God! look at his balls how hairy are they?
Dirt Bird 2: fuckin hell its like gandalf's beard!
Dirt Bird 1: HA HA HA HA YEAH AND HIS DICK IS HI NOSE!
by MIKE March 19, 2004
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A fucking retarded wizard from lotr. He is so very horny for Saruman the Many Colored. Play on words.
You're a fucking Gandalf the Gay.
by Popposs December 22, 2011
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