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!
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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*
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Another word for smoking marijuana.
I'm gonna hang out with 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.
Sex act in which the male is pulled around by his beard while blocking her passage.
My girlfriend gave me the gandalf.
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
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."