My fellow developer just sits next to me and is very nice person. But he keeps peeping into my screen and say -
"oh, why are you looking into x "
"oh, so you looking into y"
"oh, there is blog post on this"

It really turns me off :x

How to tell him politely that I don't like this.

"Stop looking at my screen, you're violating my privacy" would be one way.

Wear a headset and pretend you didn’t heard him

"Mind your own fucking business you nosey little cuntbag."

or

"Look man I really don't appreciate you constantly looking over at my screen and commenting on what I'm doing. It's pretty nosey and a bit rude, so if you don't mind, please stop."

Scream like you are scared each time he opens up his mouth

@electrineer hahahahahahahaa

Check his screen, advice him back ... Fuck him up ...

Reversed psychology

@devTea Haha. Won't work, though. I do that sometimes and people wave their hands at me to call my attention.

@gurpreet You could try just going "uh-huh" to everything he says until he picks up on your disinterest. I don't think there's a way to directly ask him to leave you alone without sounding harsh.

Don't you have some work to do?!
^^ my response to him, not you opening xy & z xD

Ok, not a nice way but yeah..

I also stop coding if boss comes by, it annoys me if someone looks in real time how I produce bugs xD
No really, I can't code if I sense someone is watching me. Same was when writing exams.. prof came by, I stopped, put down my pen and looked at him as if he needs something.. he probably thought I was cheating somehow 😂😂😂😂

Next time pull your zipper down and force him to blow you.

@gurpreet You could also try the old method "I had a friend back in college who used to stare at my screen and it really made me uncomfortable ...".

@hell that is gay. We don't know if OP and the other guy are gay

@-ANGRY-CLIENT- I was assuming they are not gay.

Smile while hearing nothing from music in your headset!
Headsets are great BTW, giving you a little peaceful cloud around your head, covering you from the outside storm.

Share this rant with him saying how stupid people are XD

@hell haha

@gurpreet
Take a screenshot of this rant and make it your wall paper and hope he will read the wallpaper done game.