Fantastic, and to do with turd, or poo.
On being late for an important meeting:

"Please forgive me, I was having a turdtastic time with my 14 year old daughter and lost all track of time."
by Angry Bob January 6, 2004
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Phenomenally shitty, uber-crappy.
- How was that new movie?
- Turdtastic, I wasn't nearly drunk enough to enjoy watching it.
by VitalyT January 11, 2011
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Turdtastic is when you poop the biggest turd ever, its so big that it breeches the toilet water & you feel the need to take a picture, its turdtastic!
Vickie had been pinching cheeks when she left the court house, when she made it to her toilet she let loose. As she stood up to wipe, she couldn't believe her eyes! Her poop had looped around the toilet 3 times and was sticking up out of the water a good 2 inches! As she wiped her butt she said to herself, "that poop was Turdtastic".
by Shucky Kunt April 20, 2021
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