Blocking the passage of something through use of wizardry and copious amounts of staff waving. Also, basically just not letting anything through, ever.
Dude, the Republican's are totally Gandalfing Obama's every move. It's like they just don't like him or something.

How did your date go?

It was great, but she totally Gandolfed me at the end. I think I saw her delete me out of her phone after i tried to give her a good night screw.
by portlandproper February 5, 2010
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Coke or cocaine in powder form. The color of the substance resembles that of Gandalf's outfit after his transformation from grey to white.
Sam: I was up all night. I might have to take a nap after breakfast.
Bil: No dude, just take a hit of gandalf and you'll be able to at least make it through second breakfast, elevensies, luncheon, and afternoon tea.
Pip: You shall not pass out.
by scoobysnatch January 10, 2013
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The greatest wizard in the world (Middle-earth) he's so cute and adorable! Everybody should have a gandalf in their life! Someone they can talk to, someone who can always offer you advice, someone with magical powers to save u from all the baddies in the world, someone who you know will always give you a hug at the end of the day!
He's like the perfect grandad that everybody wants!
Gandalf rocks!
by surfergirl April 27, 2004
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Supporting character in the Lord of the Rings trilogy. Gandalf is a wizard who "dies" in the first book but comes back in The 2 Towers. He helps Frodo, a hobbit, bring the one ring to Mordor, where it can be destroyed to save Middle Earth.
Gandalf is to Mage as Frodo is to Hobbit.
by Montezuma999 May 29, 2003
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In the first LOTR film Gandalf blows a smoke ship through a smoke ring. A Gandalf is someone who smokes so much weed that they have the same level of smoking
expertise as Gandalf himself.
Man1: "Stop hogging the splif Gandalf."
Man2: "Why don't you just fuck off and let me enjoy my bud Gandhi."
by Flossua March 21, 2009
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A cum shot to the lower jaw.
My friend shouted "You shall not pass!" at me, so I gave him a Gandalf.
by The Real Frodo Baggins June 3, 2009
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