Yes he does swear but not the one you typed he says "son of a....". I apologise for changing Mabels comment and the tummy twister its just been a while since I have seen that episode. I rewatched the episode and I see your corrections apart from the swear.
I know but the way Stan swore is sort of trade marked in comedy they put emphasis on the first or first two letters before cutting to another scene or setting plus the scene wouldn't make sense if it sounded like "FUON OF A..".
It's not really your fault and I undid Tuesdays previous edit to put it back as the way you put it but still kept it as its original swear the "SON OF A--".