It isn't often a problem. When it's busy, most pilots seem to be able to tell by the sounds on the radio that this is no time for chit-chit (lazy talk) and keep everything to the point.
I've only heard the dirty words when a radio was left open by accident.
Basically, do nothing. If it keeps happening, perhaps a polite reminder...something like "I'm real busy, please observe radio discipline" should do the job.
If it keeps happening, take it up with your supervisor.