It means to remove, delete or erase

A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.

The act of rapidly yeeting a large portion of something (Generally half as Thanos famously did at the end of Avengers Infinity war though it is often used for other sizes) into a state of nonexistence

The act of inserting ones fingers in the anal cavity and the vagina respectively while trying to snap.

When a girl completely erases you out of her life (facebook, instagram, twitter etc).

The event of Thanos snapping his dick in half while fucking Gamora

To perform a "Thanos snap" or to have a "Thanos snap" performed is to reduce something by half.