Of those, I only use "ginormous". "woot" and "confuzzled" annoy me, the rest I've never heard (and #10 was made up for the list).

woot/w00t I use more as a joke, I didn't know chillax was quite so widespread. Confuzzled has a distinct meaning, very important.

I use 'woot' and 'pwned', but only online. In one RPG I play, there's a "hoot" command that I'm using until they write one for 'woot'.

I used ginormous for awhile, but it seems affected when I do it.

I admit to occasionally using terms such as "You go girl" solely because they sound affected when I say them.

There are a lot of real words that no one uses and sound very unlikely. "Otiose" is merely one example.