Urban Dictionary

When a text-messaging distracted driver rear-ends the vehicle in front of them. Recently demonstrated by public transit drivers in San Francisco, Texas and Boston.

The involuntary spraying of saliva while yawning. Much like the venom spray from a cobra. In most cases the yawner doesn't realized it has happened only finding the aftermath once the yawn is over.

One who spends so much time browsing youtube videos that they have metaphorically taken root, in the manner of a potato or other root vegetable. A couch potato of the new millenium.

Related to Writer's Block, this is when you cannot, for the life of you, pick up a book and read it. Sure, you may be able to read a paragraph or two, or maybe even a page, but you don't retain anything of what you just read or have the attention span and/or will to go on. This is common for those who have ADD, are in possession of garbage literature, or are just so exhausted from having to read so many books during school/college that reading anything else, even for pleasure, has become impossible. To those who love to read, this is worse than heart disease and cancer combined.

A term used to designate that the spouse in control of the household finances has given approval to make a large purchase.

When out of habit you reply to a comment with "You too". This happens to the best of us.

Expendable characters. Usually say one line or less before being killed in a plot-convenient manner.
Most often seen in classic 60's Trek.