Casual dismissal of another person's opinion. Used in much the same context as talk to the hand. Best accompanied by hand actions to mimic a talking mouth.
Person 1 - "Well, I think your opinion on genetic modification is fundamentally flawed, because..."
Person 2 - "Nib nib."
(1) Something you shout when you get excited.
(2) Lyrics from a popular song from a beer commercial.
(3) A description for hair that has not been washed recently.
(1) "You wonthe lottery? That's awesome! nib-nib-nabby!"
(2) "Sing it out loud, sing it nib-nib-nabby!"
(3) "Damn! That girl's hair is nib-nib-nabby."
nedal nib amasa means that you have come to a point of boredom that can't be turned back.
Look at yourself you are bored as fuck, bored enoug to search the oposite of Osama Bin Laden, aka the greatest hide and seek player in the world