shitter

Short definition from Wiktionary

Noun

1. 1
   One who defecates.
2. 2
   A toilet or lavatory; an outhouse.
3. 3
   The anus.
4. 4
   A contemptible person or thing.
5. 5
   Someone lacking skill, especially in a video game.
6. 6
   The Sikorsky CH-53E Super Stallion.

Adjective

1. 1
   comparative form of shit: more shit; shittier

Proper noun

1. 1
   The social media website Twitter.