yo: has replaced dude. an extremely versatile emphasis word which can be placed at the beginning ("yo, this pie is awesome") or end ("that is so weird, yo") of a sentence. it can be used to get attention "yo, are the glasses in this cupboard?" or to display surprise "yo!", or even as a greeting "yo, yo, yo!"
bitchface: a noun. signifies the pinched, uptight, constipated expression that some girls (the ones who are never, ever happy and is usually seen on the girls who always yell at their boyfriends in public) wear.
poposee: origin unknown, but suspected it came from the time when steph was drunk and tried to say "possibly" but slurred it all together and it came out "poposee". ex: "do you want to see a movie tonight?" "poposee, but i'd also kind of like to go out"
manson lamps: stolen from pamie.com. used to indicate those big crazy-eyes that some people have. usually used when someone is staring at you creepily...often combined with "yo."
ex: "yo, turn off the manson lamps, please"
lesbionic: when another girl is clinging to you, or hitting on you, or trying to make out with you, she's being lesbionic.
vomitatious: an adjective describing when you feel vomit-y
p.s.: typical meaning of postscript, but used in conversation when you want to refer to something that was previously mentioned, or discussed in a conversation before but you have more to add on the subject, or found out something new and wish to share it. ex: "oh! p.s.! i found out that alex is a total whore"
squeet - like the word sweet, but a higher echelon of sweetness = squeetness.