Katva (alternate spelling: Katwa) is a slang term often used in India to refer to Indian Muslims, especially Muslim males.
Muslims are the only community in India who are circumcised whereas Hindus, Sikhs and Christians are not circumcised. 
The Etymology of the word "Katva" has been explained as follows:
The word "katwa" is derived from the Hindi root word "kat" (which is cognate to the English word "cut" and has the same meaning).
The word "katwa" refers to the fact that the foreskin of muslims is circumcised or "cut off".
And therefore the word "katwa" has become a common Hindi word often used in India to refer to Muslim Males.
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