a complete and utter wanker
A guy who talks too much and nobody wants to listen to him.
My teacher called me a complete and utter wanker for talking the whole class into a 30-minute debate about pizza.
My friend’s dog is a complete and utter wanker. It barked at the mailman for 10 minutes straight.
My mom called my dad a complete and utter wanker for telling the same joke 100 times.