An unreasonably thrifty person. (Flint is a semiprecious mineral a relative of quartz, and the notion that the greediest person would keep flint shavings for economy).

A woman who sleeps around usually with guys of the same crew.

The science of figuring out the distance between the movie theater screen and speakers to ensure an optimal movie-watching experience.

Chatting up in a flirtatious manner to advance towards a sexual or romantic relationship

Imaginary Lat Syndrome is a common case of someone, typically a male, who believes they are rather muscular when in reality this isn't the case. Those with Imaginary Lat Syndrome can typically be seen walking uncomfortably while flaring their small lat muscles and tensing their arms in an attempt to look "jacked." In reality, it appears douchey and looks like a toothbrush has been shoved up their ass. Manlets are at high risk of falling victim due to overcompensation reasons.

The act of masterbating

An actual challenge, not a prank, to see how long one can withstand swishing a full shot (the cup attached on the bottle) of Listerine - *Cool Mint* inside their mouth.

This is usually very difficult to do for most people, given the fact that the formula for most Listerine products gives a burning sensation that damages the sensitive tissue inside your mouth.

But on the plus side, the victim of the Listerine Challenge gets a cleaner, fresher, mouth.

**this is in no way promoting the products of Listerine, or any dentists.

See also: cinnamon challenge