F***

I met two friends this weekend.
It had been quite some time since I saw them.
Both had come down from US to India on vacation.

I noticed both of them using a four lettered F word very frequently.
When I knew them before, the word was not so common in their dialect.

It was not the same word used by both though; they were two different words.
One of the four lettered F word was 'Fish'.