Merriam-Webster gives us a list of their favorite top-ten words that are not in the dictionary. I've heard ginormous before, and my sister has used slickery on occasion.
I have my own lexicon of made up words and phrases, although because of cognitive displaysia, there are some things I've forgotten to add.
how about the verb "kevork" meaning to exit, to leave; derived from Dr Jack Kevorkian
"It was getting late so I had to kevork out of there and get home"