Arabic for 'pussy', or
vagina. This word is very common in
Hebrew slang. Some common phrases:
Kus emek - the pussy of your mother
Kus ochtak - the pussy of your sister
Kus rabak - the pussy of your god (you shouldn't say that to a muslim)
Kus em em emek - the pussy of the mother of the mother of your mother
Yimach shimcha ve kus imcha - may your name perish] along with your mother's pussy
etc...