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1.
A person named Jack who is fantastic.
"Man that guy Jack is fantastic"
"He's fucking Jacktastic"
by Jack Likes Fire July 04, 2007
 
2.
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