A person from Arabia (f.e. UAE) playing online games that lacks skill in the game and/or is not able to speak english.
The e-rab is a spoiled brat and filthy rich because daddy owns an oilrig.
Note that not all arabs online are e-rabs.
yesterday I was forced to play with a clan of e-rabs in MW2, we lost because all they could do was pray to allah and die.