Something that is terrible, crappy, or gay. As gay as something can possibly be. To suck to the extreme.
My internet provider is a laggy piece of crastic.
by d-Ray May 08, 2003
Exceptionally terrible. A complete and utter waste of time for everyone involved on all levels.
Everything Harry as ever posted on the internet is crastic in the extreme.
by Rozzlol May 23, 2011