In english, yes...it means retarded. A townie term for an Idiot...I have never heard it used in any other english rooted language...like american or australian.
Lichsteiner looks to me simply like a nazi, as does ziegler...the more the better I say. i wouldnt call Lichsteiner a mong. a cocky, argumentative, sometimes vicious nazi right back who loves to run. but not a mong.
and no, we DONT need mongs in the team.