Meaning

• Very bad; unpleasant; miserable; insignificant.

  "I'm feeling shitty today; I don't want to go out."

• Under the influence of illicit drugs or alcohol; drunk; high.

• Annoyed.

  "Don't get shitty at me!"

• Covered in crap (faeces/feces); feculent.

• Of low quality or standard; inferior; not up to par, or failing one's expectations