How would you explain at what point using "sau-" for emphasis (z.B.: "Das ist saustark!") becomes somewhat offensive or vulgar with some word combinations?
The aggravating prefix "sau-" is considered as colloquial the most. You would not use it in other than a family or friends setting.
According to Duden it is classified as rather strong ("derb") when used with a negative connotation.
Therefore in most situations I recommend not to use it
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1@jonas akzeptabel im Gegensatz zu "Unwetter" was wohl nur von Nachrichtensprechern gebraucht wird, die nicht draußen und durchnässt sind– bernd_kJan 6 '12 at 14:43
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With appropriate family and friends, you wouldn't use it there too. Jan 6 '12 at 19:14
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2@Takkat wenn du bis auf die Haut durchnässt noch von Schmuddelwetter sprichst, dann hast du eine ungewöhnlich gute Contenance.– bernd_kJan 6 '12 at 21:48
It is not so much inappropriate, but it sounds pretty cheap.
"Saustark" and "saugut" are the most common forms to use "Sau-". In some commercial contexts you can hear "saugünstig".
The forms where it isn't appropriate are "saudoof", "saudumm" and other combinations... where it is used to say "dumb like a pig".
I can't think of any word combinations, where "sau-" would be considered vulgar. In some situations you might not use it because of its very informal register.
