Definitions:

1. A derrogatory term referring to a person considered obnoxious, stupid, or imcompetent. NOUN
   • Don't be such a twat!
2. A stupid, annoying, or contemptible person, used similarly to idiot or jerk, but much ruder. NOUN
   • He acted like a complete twat at the meeting.

Synonyms:

• cuckoo
• fool
• idiot
• jerk
• snatch