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1.
Chaapu is the term used in IIT Kanpur for a person who is the best in his field.
Susobhan: I want to learn guitar...how can I ??

Ramdeo : Why dont you talk to a Tanmay..he is a chaapu guitar player ?
by 123qwer!@# November 15, 2011
 
2.
Someone brilliant. Common in few engineering colleges in India.
Tu Chaapu hai yaar

Bhenchod khud to jyada chaapu samjhta hai kya?

Chaap diya launde ne to!
Chaapna to hamari aadaton mein se ek hain.
by eagle in iitk June 25, 2011