"Ill-advised."-- My favorite thing to say to people for the duration of my time at LMU, usually in response to someone's story of disgust with someone else. IE "...Can you BELIEVE they did that to me!?" Me: "Mmhmm, ill-advised."
Also, can be interchanged with "Bad call," the common response to a disaster or... just a bad call.
"I scaaared meself."-- Something I picked up as a kid after listening to a Red Skelton Christmas Show in which Red Skelton plays a little boy who waits for Santa to come down the chimney in order to jump him and take all of the presents for himself. As he explains his plan to sneak up on Santa he gets so worked up that he collapses in fright, and when asked what the problem is, he responds "I scaaaared meeeseeellllf!"
"I haaaaate SUNSHINE." My usual response/description of myself when in an aggravated and/or curmudegeonly state. A reference to the witch character in The Sword and the Stone, a film I'm not even particularly fond of.
"Has he dead, Holmes?" My response to myself when I completely massacre whatever it is I'm trying to express. Usually uttered in desperation, this phrase was born while in conversation with my friend about the Sherlock Holmes film.
"Lalalala..." My random insertion into most descriptive action, kind of like saying "etc etc" or "and so on" or "yadda yadda." IE "So I was walking to work and lalala... and then a cat jumped out!" It's my way of filling in a sentence that I deem too boring to actually complete. I was called on this weird habit by new arrivals at LMU, I had no idea that I did that previously.
More to be added as they occur to me.