Arabic to English Social Sciences Slang

This word appears in a text chat between two Egyptians who are discussing what to order at a restaurant.

The "fatta" is in reference to this dish:

http://julienjulia.blogspot.com/2013/08/chicken-shawarma-fat...

A: Mashy ma fe de W fe el fta
A: Byktmo msh byshb3o bs
B: elfatta omi bt3mlha fout
B: na m3dty 8erk nw
B: na b2et blthom
A: Hwa by3mlha btre2a tnya, el roz el basmty da w fra8 w kda

Thank you to anyone who may be able to help.