Words I use frequently in conversation that many people don't understand:
interweb - this one confuses my mother, to her it's either the Web or the Internet.
thingy - this is a word a lot of people use when they cannot find the exact term they need in their repository of words.
Confusselled - I get so confused that I've confused the word "confused."
Blah - describes a feeling of boredom, melancholy, and a little bit of frustration usually associated with a significant other, or a social activity.
Wonky - I read too much Harry Potter.