a scrub is a term often used in highschools.

a scrub is someone who:
doesn't take a shower on a regular basis,

smells like stout ciggarette smoke every day
has very oily hair,

dresses like a hobo,
wears sketchers,
wears skinny jeans and sneakers at the same time.
just to sum it up. WEIRD.

there is so much more to describe. if you think about it. you will understand

Someone who sucks at life and whom smells, never showers, is extremely ugly, and has no friends.

See, Noob.

Two-bit loser with nothing to offer his woman.

A scrub^2.

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

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.