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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 05, 2010
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Sitting and staring while smoking weed, in order to solve a problem or remember something.
When I cant figure out how to fix something, Im know for Gandalfing out on the problem.
by Prince Randorson January 04, 2016
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The result of lighting a pipe perfectly as to keep the weed or tobacco burning without subsequent lighting attempts.
Here, hit that bowl quick, its gandalfing
by The apocolypse April 05, 2011
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The term used when someone driving assumes it is okay to indicate or directly change lanes before looking in their mirrors.
This confident action was named after Gandalf from the Lord of the Ring films. Assuming that he or she is the superior on the road and that others on it "shall not pass", hence the name, Gandalfing.
It is usually subtly mentioned by a passenger when they notice the driver committing this.
"Gandalf" - said under your breath when you notice them do it.
Alternatively, "are you gandalfing?" or,
"did you just Gandalf?"
by GingerBacon April 06, 2014
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When a guy is titty-fucking a girl, and when he cums, he cums on her chin and gives her a beard (like Gandalf).
A: "Hey man, guess what? I'm about to go Gandalfing"
B: "You're about to do what?!"
A: "Gandalfing. I'm about to go titty-fuck a girl, cum on her chin, and give her a beard... like Gandalf!"
B: "Dude, nice!"
by JFRANKtheTANK December 23, 2009
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When a party commits to an occasion or arrangement, verbally or non-verbally, and fails to deliver on their initial commitment (usually pulling out of the commitment at the most inconvenient time).

The phrase emanates from Gandalf's consistently flaky actions in the Lord of the Rings series and in the Hobbit series.

In the Fellowship of the Ring, Gandalf leaves Frodo and Sam after their first meeting at Bag End, parting with a promise to rendezvous with them at Bree. Of course, Gandalf does not hold up his end of the bargain. Gandalf once again abandons the fellowship of the ring, this time more extravagantly, as he selfishly decides to pass into the afterlife after battling the Balrog in the Mines of Moria.

In the Two Towers, Gandalf abandons Aragon, Legolas, and others at Helm's Deep just before the battle begins.

In the Return of the King, Gandalf leaves middle earth as the sails for the Grey Havens, an Elvish paradise.

In the Hobbit, an Unexpected Journey, Gandalf leaves the company just before they are attacked by trolls.

In the Hobbit, the Desolation of Smaug, Gandalf bails on the company just before they enter Mirkwood. Subsequently, the company is captured by spiders and then elves.
Rett: Hey, want to play ultimate on Friday night?
Larson: Sure man.
{Friday night}
Rett: Hey, are you coming to ultimate?
Larson: I can't go anymore.
Rett: Damnit. Stop Gandalfing.
by Redbrother January 15, 2015
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Verb; To Gandalf.
Is the act of denying an opponent's pass, shot or cross during competitive play by means of solid blocking.
Is most notably and skilfully executed by UNSW women's football players.
'Did you see her? She totally Gandalfed the shit out of that Nowra chick's shot'
"Look at how bad Apia are at Gandalfing"
by UNSW May 24, 2012
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