" It'* better to be pissed off than pissed on" nuff said
"Hmm.....how bout that" said most often when my girlfriend or someone else says something thats rather...intriguing
"It'll be aight" said to answer every crisis from a lack of cheese to breaking important things, and yes I know "allright" is spelled wrong. You have to say it slurred with a mid of southern/midwestern flair.
Im sure theres more but I cant think of any that I say all the time.