It is the cross between giant and enormous - I came up with this word while sitting in a restaurant with friends. We all laughed about the "gianormous" steak and eggs breakfast served to us.
Look at the size of that steak (tiny) - "it's gianormous"
A gaseous cloud of flatulence that is large enough to fully blanket a large city.
It was an astounding and ginormous fartcloud, one that was at least a thousand times larger than the largest clusterfart ever measured by fartologists.