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
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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
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The sexy old man of LOTR. although hes completely gay, he doesn't go for his co-worker, and also gay elijah wood. (elijah's with sam!!)
Gandalf is the fucking coolest old man ive ever seen.
by duxchic17 May 16, 2004
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A Sex act that entails spreading ones asshole and yelling “You Shall Not Pass!” directly into it.
Kerry (a short squat hobbit looking girl) is bent over by a man that looks like Ellen Degeneres. He spreads her asshole and yells YOU SHALL NOT PASS directly into it. He has just gandalfed her. He has done the sex act Gandalfing.
by Tizms September 27, 2017
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Getting a woman on her knees and ejaculating on her chin so it drips and looks like a beard
I took Kayleigh home and gandalfed her.
by stubblehead August 10, 2016
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