HI, If you mean 'the F word', it offends many people. On the other hand, a lot of people use it casually all the time. Outside my local high school, for example, you hear it several times every minute.
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DV The thing is that I was also told that if you want to make friends, you should use some F or S word casually too.This is not true at all. In general, it is extremely socially dangerous for a learner to attempt even slang—much less obscenities!—in any situation.