The word "nààb" (and later on "naab") is derived from the word n00b meaning newb, newbie or beginner in internet slang.
Etymology: on azerty keyboards the "à" is on the same key as the "0": shift+"à" gives "0".
In the heat of a squabble
people sometimes miss their shift key and end up typing nààb instead of n00b. Of course these
people are so l33t that there typos become new
words.