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1.
Llewellyn has a magnetic pull and like a moth to a flame, there is nothing you can do but ride through the experience.

Llewellyn is very intense, deep and mysterious like a volcano deep under the sea ready to burst into eruption at any moment. With a very calm exterior he is always experience deep and extreme emotions on the inside. Very determined and passionate with every project he takes on no matter how small.
That man is very dark and mysterious, he must be a Llewellyn.
by Jezebeth13 May 18, 2011
 
2.
Often an extremely attractive, yet short Welsh Man with a very calm exterior, but in retrospect, a terrible temper. Llewellyn is not one to get into a fight, but when he does, he will most certainly destroy the person who has enraged him. Llewellyn has a large vocabulary and an astronomical understanding of the english language. Llewellyn is terrible at mathematics. When Llewellyn falls in love, he will treat his lady as if she is pure gold, because Llewellyn is a gentleman that has the utmost respect for women. Llewellyn is the perfect boyfriend. He is loyal towards lovers as well as friends. Llewellyn has no fear. He is often doing stupid things. Llewellyn often prefers going by the name "Lew", "Lu", or "Lou".
Girl 1: "Oh my gosh, that guy is attractive! Who is he?"
Girl 2: "that's Marcy's brother, Llewellyn! Oh he is so dreamy! A true catch! I wish he would notice me..."

Guy 1: "Dude! Josh and Llewellyn got into a fight!"
Guy 2: "Really? How badly did Josh get beat up?!"
Guy 1: "it was terrible dude! Llewellyn just went Ape-shit!"
by DGE November 03, 2012
 
3.
Usually a small welsh person whose quite quiet.A kid who sits in the corner but has friends.Only bad thing is they cannot control their erections.

!Person: Wow u see that! Hes a fucking Llewellyn
by celestine ;) April 13, 2009
 
4.
a kid who can see only slightly better than Ray Charles
Bro #1: Dude check out that blue car.
Bro #2: Are you fucking llewellyn? That car is yellow!
by Kenneth L May 13, 2008