Using a social networking web site or service to connect to other people but never communicating with those people once they have been established as a connection.

The friend request sent right after meeting someone for the first time.

Thoughtless, careless sex happening right before a major disaster or possible ending of the world, without thought of consequences.

An affirmation that you agree with or can relate to the preceding statement. It can be used whether the speaker actually knows or not, but in the latter case it usually means that the speaker can attribute the preceding statement to themselves as well.

a passenger at the bus who hogs the aisle seat

An irresistible force that draws you back to bed, or toward any mattress, couch, or other soft horizontal surface. Usually stronger when one or more persons are already on said furnature.

When a person is out of the loop or not up to date on pop culture, and your attempts to explain them just confuse them even more.