When you see something for the first time and you wish you had never seen it in the first place.

When an experience happens, you might feel like you've gone through that experience in the past even though you haven't.

Déjà vu is the experience of being certain that you have experienced or seen a new situation previously – you feel as though the event has already happened or is repeating itself. The experience is usually accompanied by a strong sense of familiarity and a sense of eeriness, strangeness, or weirdness. The “previous” experience is usually attributed to a dream, but sometimes there is a firm sense that it has truly occurred in the past.

the feeling when something has happened before when infact is is a brand new experiance to the person.

scientists think its when one side of your brain is working a few seconds or even milli seconds faster than the other side.

n.

1. Sarcastically highlights moments in film or television that viewers find trite; inferring the moment is cliché, and could’ve been used in the trailer, preview, or sneak peek, as a means of generating hype. When used, the term embodies a condemnation of Hollywood cinema, the failure to innovate, and a reliance on cinematic clichés as a means attracting, and maintaining the appeal of a broader audience. Examples are often defined as corny; and identified in scenes described with intense action, powerful emotion, witty one-liners, or general “awe”.

Not to be confused with Trailer moment; Trailer déjà vu refers to instances not actually found in the theatrical trailer, preview, or sneak peek.

the moment when you are listening to a song on the radio, change stations, and hear the exact same song playing.

(noun) - The feeling you get while jerking off to a video of your ex-girlfriend on the internet (that you posted) in which you are having sex with her.