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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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 7, 2010
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Sex act in which the male is pulled around by his beard while blocking her passage.
by Sbmetalhead August 8, 2018
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Where a man lie's flat on his back while a woman gets another woman by the head and forces her head on to the guy's dick.
Hey ladies, you up for a gandalf's staff?
by Sorry banged yer maw October 28, 2013
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The art of talking out of your arse and lying about every single thing. It is also the art of heavily breathing down a microphone regardless of how many times someone asks you to stop.
Someone says - "My grandad blew away in a tent"

One is to respond with - "that is bullshit. You are gandalfing"
by ThunderFox69 December 17, 2017
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