poeple usually say this at random times when bored out of their minds
Erin*:"la-la-lala elmos world..
The noise you make when you refuse to listen to somebody and drown out their words with your own noise. Usually accompanied by sticking your fingers in your ears or shaking your head.
"We're both adults, right? Well, last night your mom and I were having maritals
and she wanted me to try ... "
"I am not listening! La la la la!"
It's what you say when you've been in your house all weekend studying/working/doingyourstupidf*ckinghomework and on the verge of going literally insane and since you are going so delirious you say random stuff, like lalalala.
Dude: *working on Math* lalalala (and then talking to self) lalalala (and then talking to imaginary friend) lalalala.