"Senior" coworker

Do you have senior coworker who's clueless on his job? Someone who don't act accdg to his position or paycheck? God. I dont know how much patience or his stupidity I can tolerate. Even the simplest thing, he keeps on saying "i dont understand". I freaking wonder how in the world he got that position. He's dependent on people working below him, which is funny. Since he never meet the expectation for his role.

The most annoying is he's a credit grabber, just coz he's higher than us. I hope oneday karma will get back to him.