A completely useless individual who is unaware of his/her own complete uselessness.

A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.

A completely useless creature that does nothing but cause nuisance and aggravation.

Originally coined in the US Navy by sailors tasked with washing decks clean of the massive amount of avian excrement created by sea birds that shit all over everything.

Has come to define any living creature, human or otherwise, that is without redeeming qualities.

Comical but frequently used insulting military jargon generally used to denote a lower ranking enlisted person whose uniformed appearance and/or job performance is substantially unsatisfactory ('un-sat'). A person who can be counted on to screw-up the most simple of tasks, and generally not entrusted to handle much more than the menial. Also utilized among civilan population albeit with far less frequency and familiarity; does not resonate with same defamitory impact as when used in military circles.

A military term used to describe an unsat Marine/Soldier/Airman/Sailor.

Your above average asshole that usually will do things to piss you off or screw you up so they may further their own perceived wellness. Often also does things not knowing how much they are a screw up but again generally fucks you over.

From military slang and jargon. A term used to describe anything that is unacceptable or just downright shitass. Also a term of endearment for friends. See also: shitass

"Tweet tweet. Here comes the bird. The Shit-Bird!"