An condition where your thoughts are jumbled and your brain is just generally not functioning well. This is metaphor comparing the unorganized thoughts to food items floating about a soup without any direction. This is often caused by overworking yourself, having a hangover, or something similar. It's comparable to being brain dead.

n. The aftermath of a classic headshot. Often used in games and movies to indicate a killshot. Depending on the rating and nature of the media it ranges from simple blood spray to a graphical display of parts of the brain and/or skull.

Can also be spelled without a space, as brainsoup.

A stupid person, an idiot, someone who has no idea what is going on at any given time.