An adjective used to describe something that was initially pleasant or fantastic, but ended up really shitty.
Shittyness usually progresses.
Guy: Today was so shitastic.

Guy 2: What happened?

Guy: Well everything was going good until my girlfriend

dumped me for her stepsister.

Guy 2: Man that sucks!

Guy: Yea and that's not even the worse part, turns out she

gave me herpes too. Oh and someone stole my iPhone

outta of my car.

Guy 2: That's so shitastic man!

**************

Girl: Man, Kelly is such a shitastic bitch.

Girl 2: Why, what'd she do?

Girl: Well she seemed totally cool at first, but the I found out

she's been sleeping with my father!
by TheWordCreatorOriginator December 14, 2011
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Something extremely shitty. So shitty that its almost great.
Q: So how are you today Alex?
A: Shitastic.

Wow, that hangover was shitastic
by Anonymous January 23, 2003
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Something that is really horrible for someone, but really awesome and exciting for you.
Nurse Traci stated, "You can wake me up if some shitastic comes in the ED."
by purdymouth October 10, 2014
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When you're day goes fantastically shitty. Or so shittly fantastic.
Damn.. my day has been shitastically amazing!
by TheListo October 24, 2010
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somthing that is shity or really sucks. Like saying someone or something is shity in a better way.
That shirt is fuckin' shitastic.
by jheremy December 12, 2008
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Something allegedly fantastic or good that you know to actually be unbelievably shitty.
Person A: Everyone likes dogs because they're so great. You like dogs, right?
Person B: Yeah, dogs are shitastic.
by John_the_WOTist March 13, 2003
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