Merlin's gag usually occurs after intimate pubic relations. In involves finding a rogue, ominously thick, hair at the back of your throat. Merlin's gag ensues, it's a cat like reflex, but no matter what you do that sucker is not going anywhere.
Jesus, I've had a Merlin's gag on all day! I knew I should have wet shaved her first!
by JosieA May 11, 2007
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The Merlin's Sleeve is a certain, and not uncommon 'breed' of female genetelia, commonly found in the Middle Eastern region. The Merlin's Sleeve is the complete opposite of a "Camel Toe" and refers to a female's vagina with a protruding, saggy Labia.

Named after it's uncanny resemblance to the sleeve of Merlin the wizard's robe. Merlin's sleeve is uncommon amongst females under the age of 14.
Person 1: "I could tell i wasn't her first"

Person 2: "how so?"

Person 1: "she had merlin's sleeve mate"

Guy 1: "I finally got off her underwear only to realize Merlin had left me a gift."

"Martina"
by Yeah, i'm awesome January 31, 2010
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The act in which a male, during 69, ejaculates on his partner's face and then immediately flips her off of his body. He must then immediately grab a handful of glitter (which he had in his hand, pocket, or on the bedside table) and "cast" it into his partner's face. The glitter will adhere to the partner's face, leaving her "under his spell". The male can then, if desired, yell "EXCALIBUR!" at the top of his lungs.
"So how was it with Gabi last night?"

"Oh man, she had no idea, I pulled off the Upside-down Merlin. That bitch is totally under my spell."
by The Wizard of Cock April 26, 2009
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This is a simple thing that has taught LA a lesson. White Chocolate Merlin is a powerhouse that can't be stopped!
I was out kicking it yesterday and White Chocolate Merlin approached and took my girl. I think he got her pregnant!
by blopel July 30, 2009
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If something is out of your MERLIN (or Mental Realm Capacity) it means that it is out of your understanding, knowledge or comprehension.
Person 1: Hey do you know how this works?
Person 2: No, It's out of my MERLIN
Person 1: Your what?
Person 2: my MERLIN, Mental Realm Capacity
Person 1: What?
Person 2: you wouldn't get it, it's out of your MERLIN
by Gezzed June 6, 2011
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When having sex with a young lady one withdraws his love staff at the point of ejaculation and sprays his love muck on the lady's chin. The jizz should start to hang down off the chin, creating a rather fetching white beard look, similar to Merlin's.
"Hey guess what Rich, I did a Merlin's beard on your mum last night!"

"Oh right I just thought she hadn't shaved!"
by Ste Crayston December 5, 2006
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A layer of semen on a girl's face in areas where facial hair is commonly found on men, e.g. chin, upper lip, cheeks, neck. Usually results after a blowjob.
"Do you want a blowjob, sweetheart?"

"Yeah! How do you want it to end today, honey?"

"I'd love to have a Merlin's Beard, but whatever you want. It's your special day."

"You want it, you got it!"
by Merlin's Wife July 2, 2009
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