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girls who live in the city or go to city of london school. These girls are generally rather attractive, witty, intelligent and altogether quite inspirational people. This is also the prase used in the concept 'city gash points'. These points are given to city gash who have achieved something great.
e.g he is so peng, you are going to get so many city gash points for him

e.g. come to the party! i heard loads of city gash are going
by 04citygirl March 07, 2011