Not really, I don't see the point of holding back the swears for 'fudge' and 'mule' and stuff like that, if you want to swear, just say the word. However, if it is a very formal and respected area you're in then for the love of God zip your mouth before the elders murder you.
I only make up stuff when I'm around people I don't want to swear around. Last time I was playing New SMB Wii with my sister and cousins, I kept saying "Shimama" for some reason. idek.