"Kat kat kay marogi" in Hindi slang is a very crude and violent way to say "You will be killed (slowly and painfully)." It literally means "you will be killed by being cut/chopped."
The "kat" part refers to the act of cutting, while the "marogi" is the future tense of the verb "marna" which means to die.
Here's a breakdown:
* Kat: To cut, chop
* Kay: By means of, through
* Marogi: You will die (future tense)
It's important to note that this is extremely vulgar and should not be used in polite conversation.
It's also important to note that the context in which this phrase is used can influence its meaning. It could be a threat, a boast, or even a joke depending on the situation.