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1.
Abbriviation of the word 'Christchurch', a city located in South Island of New Zealand.
Often used in written form.
'Hey Frank, where are you from?'

'Chch, NZ' (Christchurch, New Zealand)
by Karl Leung November 29, 2005
 
2.
whenever you see an attractive person and want to point it out to your friends or who ever is with you
Girl 1: "Ch Ch!!"
Girl 2: "hes cute :D"
Girl 1: "i know"
by Fantasyy. May 24, 2011