Definition of "shitty"

It's a well-known fact that reading is about the shittiest thing you can do for your eyes.

1988 November, Byron Coley, “Underground”, in Spin‎, page 101

Except for Rasheena, the rest of the baby mamas was at least struggling to live halfway right. They used to clown and act shitty whenever they came by Noojie's and saw Carmiesha there. But every last one of them ended up being grateful to her for the things she did for their kids.

2006, Noire [pseudonym], Thug-A-Licious: An Urban Erotic Tale, New York, N.Y.: One World/Ballantine Books, page 128

The difference is they usually have a shittier singer, and no originality.

2006, Everett True, Nirvana: The True Story‎, published 2009

Halfway there we turned off the highway onto possibly the shittiest gravel road I have ever driven. In Canada, we would call it washboard; in Australia they call it corrugated, but you get the point.

2011, Rik Leaf, Four Homeless Millionaires‎, page 134

“She's a shitty teacher, but Ault was in a bind.” But she hadn't been a shitty teacher when she'd been hired. She'd never taught before. And who was Aspeth to decide she was shitty now? She was still inexperienced.

2005, Curtis Sittenfeld, Prep: A Novel, page 157