So the next time you hear someone do that, ask him/her if they realize what they are saying. If not, you would do them a kindness to let them know that what they are saying is nivul peh in English. Maybe they will stop saying it. If they ARE aware of the meaning of the words they are using, or that it is offensive language, and they choose to use it anyway, you can expect them to probably continue, even if you express your dismay.
Hebrew is the only language that in and of itself has NO nivul peh. All the scatalogical expressions uttered by some Israelis, are Arab or another foreign language, in origin.