An exclamation, spoken with great gravity to a MTF tranny whose member has begun to bulge from under her frock.

Derivation: Sir Ian McKellen, the wizard in flowing robes: "You shall not pass!"
It was off to the Ladies Room, after Hedwig's friend bent over and whispered in the tranny's ear: 'Gandalf! Go check yourself, girl!'
by valeriegirl June 8, 2009
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to be so gassy that you feel that you are able to make a ship out of the gas that has just excreted from your anus.
I am gandalfing the nina right now....everyone watch out
by gamontro211 August 22, 2007
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Gandalf is a white calico cat who licks a graham cracker every Monday on TikTok
Today is Monday which means Gandalf gets to lick a graham cracker. It is her favorite activity

Gandalf the cat is an internet celebrity
by Memequeen21 September 5, 2023
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The Dirty Gandalf is the art of masturbating on to the Chin of your partner, creating a messy white beard of spooge, they must then shout "You shall not pass!". To add extra credibility to the act, midgets dressed as Hobbits may be used as well as other props like robes, staff etc. Photographs must me taken for posterity.
Darling , I have ordered midgets for tonight, get your robe on, its time for Dirty Gandalf to arrive.
by Tuncy Sloblock April 30, 2014
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When a lad requires the assistance and guidance of a lass in order to pull some fit piece of ass, the lass in question is providing the role of vaginal gandalf
Dan: hey I need help getting this girl's number

Bekah:Don't worry bro I'll be your vaginal gandalf and wing woman you
by Hipposyawn January 27, 2017
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Verb: When a man with a long beard gives head and wraps his beard around the shaft.
Dude, Gimli gives the best whistling Gandalfs.
by WalksN2Mordor March 8, 2017
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The first solid poo to make an appearance after a long hard fought with diarrhea, signalling that the tide has turned.

In 'The Lord of the Rings: The Two Towers', the Battle of Helms Deep is all but lost until Gandalf the White appears, handing victory to the men of Rohan against the Uruks of Isengard.

Similarly, the arrival of Gandalf the Brown reveals that the battle for control of your bowels has been concluded in your favour.
Guy 1: You coming swimming later?

Guy 2: I can't, I have a bad stomach, I need to rest.

*30 minutes later*

Guy 2: I'll be coming after all, Gandalf the Brown has arrived.
by jackholdmebackwilshere June 4, 2016
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