Popularized by Jack Skellington from Tim Burton's The Nightmare Before Christmas, but also used in place of skeleton as seen in Scarygoround, a webcomic by John Allison.
Yikes, I just saw a walking skellington!
by Izzabehr September 4, 2005
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A skeleton, but as per "hilarious" British radio DJ, Steve Wright
I went to the doctors and they had a model skellington in the corner.
by Charles De Mar June 16, 2015
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If someone is using a skeleton and/or skeletal avatar and/or signature on a forum, or can medically be described as a skeleton, they refer to themselves as Skellingtons in the hope of a small ego boost. Also used by n00bs when trying to describe a Skeleton.
Waz: "LEIK, ZOMFG SHAI ICN'T SKELLINGTON?!"

Shai: "No, Waz, I really am a Skellington."
by Noosh August 28, 2005
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King of Halloween Town. Brilliant, maniacal, soulful, with a singing voice to die for.

The embodiment of the phrase Dead Sexy
Oh somewhere deep inside of these bones, an emptiness began to grow. There's something out there far from my home. A longing that I've never known.

Eureka! This year, Christmas will be ours!
by Tephers July 27, 2004
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While balls deep in a vagina from behind whilst wearing a skeleton costume and a pink sock starts sneaking its way out, quietly peel off an arm bone and jam it in her anus while you continue merrily on your way to ejaculation.
Last Halloween, I had to Jack Skellington this nasty hoe before her pink sock exploded on me.
by Slap Mint September 27, 2019
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Maddie: "our man Jack is king of the pumpkin patch"
Gregg: "Jack Skellington freaking rocks!"
by deejaylovesmaddie December 27, 2010
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