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1.
Something that is very prison-like, Often a common item that can be made into a prison weapon.
"WOW, that melted pen is SHANKTASTIC!"
by Pyrotastic December 01, 2007
 
2.
of or pertaining to the state of being shankable.
Man, did you see my new prison shank I just got in the mail?? It's full on shanktastic!!
by roller03 February 10, 2011