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I use made-up words all the time, I just can't think of most of them right now. A few I use commonly:
WaadindaWhat in the...?
ub3rnessExpressing qualities of being ub3r.
UUUUUUUUGHHGenerally used when I'm forced to do a tedious task or have received bad news. Also when I want to do something but am too lazy. Pronounced "uuuuuuuu-uugh"
pfffYeah right.
nrunggghA variation of "UUUUUUUUGH"

...now you can see what my world's like. There are plenty of other words too.
I don't swear. Except the occasional slew when I end up down 17-0 in the first quarter of Madden NFL 2008 =P
My copy of it is really glitchy...whenever I play a good game in Superstar Mode it freezes.