Top Definition
A person named Jack who is fantastic.
"Man that guy Jack is fantastic"
"He's fucking Jacktastic"
by Jack Likes Fire July 04, 2007
1 more definition
used to describe an action or event that is so insane in a good way that makes you want to just whip it out and whack in a frantic fury

refer to cumtastic
Did you see those hot chicks makin out?! That was definitely jacktastic!

I love Ash's chesticles! Them thangs def be jacktastic.
by Sánchez February 20, 2005

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