When an individual suffers repetitive strain injury (RSI) in the first digit of the hand (thumb) from excessive text messaging.

A variant of "that's what she said." Instead of referring to sexual connotations, it is used to refer to spending a lot of money, making a mess, or fucking up very badly. Arose after the 2010 BP oil leak in the Gulf of Mexico.

Snacks and food samples that a grocery store will serve at various locations in order to tempt the patrons into buying something they weren't planning on (pizza, chips and dip, sausage, etc.). Usually happens on the weekend.

the lack of drink specials during the hours of 4-8 pm on weekdays at a bar

The condition where a group of people sharing a living space each avoid doing a household chore for an extended period because each believes it's someone else's responsibility. The idea is that eventually the situation will reach a critical mass where the guilty party will cave in and do the chore. In practice, the situation can escalate to extreme levels.

(n.) a play on words which mixes two common metaphors: "rocket science" and "brain surgery"

An expression that explains how a joking or friendly conversation suddenly took a turn for the worse and is escalating towards a hostel situation and/or a physical scuffle.