If during oral sex you ejaculate into you partner's mouth and they spit the cum onto your chin.
I totally gave him the Cumming of Gandalf the White! That's what he gets for cumming in my mouth!
by Crotch Club November 20, 2007
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Gandalf High-five

A Gandalf High-five is an awesome type of high-five which is reserved to only those who have met Sir Ian Mckellen.
Jason: eeeeeeh, I met Ian Mckellen.
Michael: Gandalf High-five!!!!!

*HIGH FIVE takes place*
by corbane December 07, 2010
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Sloppy Gandalf

Spray of mucus and vileness producing films of desk fungus and cubical rot, often followed by moist nasal clearing.
Frumpy just sloppy gandalfed and needs a wet nap.
by Cubewarrior February 02, 2017
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The gandalf

Sex act in which the male is pulled around by his beard while blocking her passage.
by Sbmetalhead August 08, 2018
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Gandalf the Grey

And Gandalf the White, and Monty Python and the Holy Grails Black Knight and Benito Mussolini and the Azure Meanie and Cowbuy Curtis and Jambi the Genie, Robocop, The Terminator, Captain Kirk and Darth Vader, Lo Pan, Superman, Every Single Power Ranger, Bill S. Preston and Theodore Logan, Spock, The Rock, Doc Ock and Hulk Hogan
by Gvprtski March 25, 2024
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gandalfism

the metamorphosis of a person in a mature and wise state
"Boh had a lot of things to deal with lately. He went through gandalfism."
by chopinhower December 22, 2016
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