OMG: Expressing astonishment, excitement, embarrassment, etc.
LOL: Originally and chiefly in the language of electronic communications: ‘ha ha!’; used to draw attention to a joke or humorous statement, or to express amusement.
tinfoil hat: A hat made from tinfoil. With allusion to the belief that such a hat protects the wearer from mind control or surveillance (esp. by extraterrestrials or the government).
couch surfing: The action or practice of sleeping overnight on a couch (or in similar makeshift accommodations) as a houseguest, esp. in a series of homes (often as a substitute for permanent housing).
muffin top: A roll of flesh which hangs visibly over a person’s (esp. a woman’s) tight-fitting waistband.