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
Get the Gandalfing mug.
Verb
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.
{Monday}
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 16, 2015
Get the Gandalfing mug.
To be Gandalfed is to be blocked or stopped from passing
Hey Pete I tried to overtake you on the way home and you totally Gandalfed me!

"having my mate around on a night out is a real cock Gandalf"
by Wilsond December 23, 2013
Get the Gandalfed mug.
To mess up or die in an exceedingly excessive manor. Source: Gandalf's death scene - fighting the demon all the way to lower-earth, and also Gandalf the Beta fish. Gandalf impaled himself on a spiky plastic plant - from gill through eye.
Example 1: "Dude, you totally gandalfed yourself last night proposing to Jenny. An oversized engagement ring around your pecker is not romantic."

Example 2: "Did you see that wreck on the 405 last night? That girl was totally gandalfed."
by NoSugarAdded May 21, 2007
Get the gandalf mug.
a terrible and or unfunny joke/sarcastic comment or supposedly funny statement
used as a verb or adjective.
people considered gandalf are often rejected from friendship groups etc
person 1: why was the chicken so happy?
person 2: why?
person 1: because everything was eggcelent!
person 2: thats a gandalf (or just plain 'gandalf')

person 1: god that guy is such a gandalf
person 2: ikr
by vrysrslysrs September 24, 2010
Get the gandalf mug.
"Did the DJ kick your (fucking) face off?"
"Yes, he was fucking Gandalf!!"
by Sigmund Freud November 3, 2004
Get the Gandalf mug.