"Girl you must be tired because you've been running in my mind all day"
"Dude look at that guy he has a mullet"
Watching a movie that is based on the past yet there are things in the movie that are current.
These are examples of things that can said or done that are often referred to as corny.
The status of "corniness" is achieved when something picks up old and overused fads just to "fit in," falsely believes it is cool, and then takes itself too seriously, resulting in a complete destruction of its social life.
guy 1: What's your gamertag?
guy 2: boneurmom69_420.
guy 1: you corny son of a bitch. *guy 1 throws guy 2 in front of a speeding cement truck, picks up his flattened corpse, and tosses it into a gaping abyss from which there is no return.*