When you say something is Merlin you are saying it is great, awesome or rad to the max . The definition derives from the world Wizard that doesn't do the awesomeness the justice it deserves.
Last night was totally merlin, it couldn't have been better.

That back double tricky you did was merlin!

That layout for that ad is merlin.
by grassharper July 20, 2009
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A word used to replace the overused words "sick/cool/legit". Based off an idea from some white kid in Palo Alto, CA. Derived from merlin as something magical/cool, and therefor, awesome.
Kid #1: Woody freestyles be hella merlin
Kid #2: True, but I heard Spencer's are merlin as fuck!
by Merlin 650 December 19, 2008
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An all-powerful dick wizard, gives temporary penises to all your female companions. The perfect solution for lesbians and futa fetishes. Enables swordfights for both genders.
Dammit Merlin, I wanted a horse penis not a chode!
by ChaosInACan June 10, 2020
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A queer magician from a far away Galaxy, referered to by his homo sexual french Canadian band of wizard homo's as "Alexandre" When he is not casting spells to have sex with drunk men at his local bar in Dorval, you can find Merlin blowing guys on a backstreet in his Mustang space machine.
"Man I just saw this dude with glasses and blue hair blowing 3 dude"

"Man it was probably Merline"
by joey stuffs December 10, 2011
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When your at mardi gras, standing on a balcony and see someone you dont like. You whip it out, wack it off, and shoot your load into your hand. Then, throw the load off the balcony while reciting the word "Merlin"
Jack: Hey, isn't that your girlfriend making out with that guy down there?
Jim: Grrrrrrrr... "MERLIN"
by littlejo2k December 21, 2004
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A cult around a cat named Merlin. Disrespect his wishes and be publicly executed.
Hey want to join my cult, Merlinism?
by Merlin the goat November 8, 2020
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Either a name, traditionally of an old wizard but is an uncommon but still used forename, or something can be described as being merlin, replacing the outdated "cool"/"sick"/"wicked"/"awesome".
Friend of Merlin: "Hey Merlin."

Someone does something amazing.
Onlookers: Fuck man, that was merlin!
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