When you are tryimg to sleep at 1am and your little brother is fucking talking to his girlfriend on his phone. Also when you can't concentrate because your fan is a piece of shit and it sounds like a Lil' Wayne Beat.
Me: Shut The Hell Up! It's 1am, let me sleep!
Brother: No!
Me: You are so fucking annoying...
Me: I should fix that retardedfan.
Me: It is so annoying!
Causing irritation and annoyance. This word is very well-known, it would be odd if you didn't know this word before. Nowadays, people are growing more and more annoyed, and it is mostly caused by other people's bullshit. It probably has a latin origin but whatever.
the shit that I just pulled off was annoying, and it probably gave you the urge to castrate your very own testicles.