dressing like a homeless person

A scrub^2.

Something they say about 500 times per episode on Grey's Anatomy.

A guy who mooches off of everyone else and has nothing going for him in life. Probably still lives with his mama, doesn't have a car, a job, or a plan.

A commonly used Northern Irish term meaning to be hit by a vehicle. It is mostly used as the past-tense of 'scrub' which can be used as a verb or a noun.

Our variation of the word 'scrub' is more akin to the act of washing (scrubbing) than the millenial definition of scrub which has no real definition and can be used to refer to anyone and anything.

Scrub as a verb.

/skrʌb/
1. To hit (someone or something) with a vehicle.

Scrub as a noun.
1. Scrubbing (someone or something) with your vehicle.

To wash the hands and forearms very thoroughly, as for surgery. To scrub in implies the use of a brush (and often an implement to clean under the nails). To scrub in, to scrub up, and to scrub are synonymous.

A scrub is a more derogatory form of the slang "noob", "nub" etc. and is primarily used in video games, particularly those which are multiplayer based.

Whilst a noob is generally considered one who is new to the game, and as a result not proficient, a scrub need not necessarily be new. It may imply that the person accused is forever a noob, regardless of how much they may practice.