LOL Y'all got me rollin' over here!!!
I don't know where she got it, but my mom used to (when I was younger) say "sugarbear" instead of isht... I.E. "OH SUGARBEAR!

" LOL
I got into the habit of saying "Funk".. I.E. "Funk that!!!"
And for those times that you absolutely HAVE to curse, to take the sting out of mofo, a lot of my friends and I say "mother-B*tch"... LOL ... Yup.
A frew girls I know say "Son of a Wh*re", but I don't know how much better that is than anything else..