1. A person who does not want another person to succeed by showing the following actions: Disloyalty, Jealousy, Slander, Two-faced behavior.

2. A person who uses another for personal gain or self gratification.

Synonyms: Hater, Back Stabber Leach Free-Loader
1. "Just like crabs in a bucket, won't nobody let nobody up"

2.I told you that "Crab" was not going to come to your show.

3. I loaned her some money and I know she received her bonus, and that "Crab" has not even mentioned my money
by 1Real813Beauty October 15, 2010
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Three accepted meanings:

1 A unit of brightness of nebulae. A nebula is a cloud-like object visible in the night sky, using a telescope or binoculars; think milky squished star. It - a Crab - is, by definition, equal to the brightness of the Crab Nebula, which was seen as a supernova in 1054 A.D., by Chinese and Arab astronomers; also known as the nebula M1 (Messier1).
A Crab has a sub-division millicrab, which any half-competent student of the metric system will be able to tell you is a thousandth-part of a Crab.

2 A hard-shelled crustacean, with a body generally wider than it is long, two pincers, and a wide variation in size, ranging from pea-crabs, about the size of the eponymous vegetable - to spider crabs, which have a claw span of three or four metres/yards in large (= old) specimens.

3 Pubic lice. This indicates that you may not have been too careful aboutyour fuck-buddies.
1 The new nebula is about five hundred and twenty millicrabs - say half the brightness of the Crab Nebula - said the little blonde astronomer; plainly, she didn't seek to sensationalise this new discovery.

2 Crabs can be caught in many coastal waters - but be careful picking them up, as they can nip.

3 'That damned soccer-jock gave me crabs - he must have shagged Brutus last week!' said Pandora with resignation, whilst counting her plentiful takings.
by railtracksurvivor May 01, 2009
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a pubic louse(usually plural)
That girl had crabs. Why would you even think about having sex with her?
by Light Joker October 12, 2004
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A mother who nags non-stop about everything.
i.e. Emilce De Girolami
by Crab's daughter June 19, 2010
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Species

Crabius Hater-aid-ius

A species best know for the ability to pull town another when they see poisitive actions going on without them. The Crab is in of itself a credible individual capable of doing great things ,but through the use of an over inflated ego causes division.
The Crabius Hater-aid-ius
by G from the A February 24, 2008
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Suspicious behaviour or individuals, usually experienced within the marijuana smoking community. Applicable as a noun, verb and adjective, the definition of Crab varies depending on the context.

When used as a noun, the Crab is the individual who is acting suspiciously or flamboyantly.

When used as a verb, the action is the behaviour of one who is being suspicious or arousing suspicion.

When used as an adjective, it is descriptive of either the noun or verb, once again depending on context.
Hey man you're crabbing me out here, don't be a crab.
by ThcLordCrabman January 16, 2011
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