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1.
it's a question. 'what are you up to?'
chupto biatch?
by Wai August 21, 2003
 
2.
A greeting. Portmanteau/contraction of 'What are you up to?' Similar to 'sup'
'Chup to, man?'
'Nada.'
by ReinhardtBII November 21, 2008