Narm. Hands down. It makes me giggle every time I read through the examples.
BFS, Big Bad, So Bad it's Horrible and Mondegreen are other favorites.
I found out today my school computers don't block TVtropes. I will never get any writing done ever again.
Actually, TVtropes has me talking like the website. I used Genki Girl on my last English essay, and I'll frequently use the terms in normal conversation, with my friends who have no clue what I'm talking about.
Edit: OH! Crowning Music of Awesome, too.