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15.
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
 
16.
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
 
17.
offensive term for Crips
yo, that crab is a pussy
by me December 22, 2003
 
18.
little bugs that crawl and bite your nut sack
me : DUDE! guess what !!??
jon: what!!??
me : my sack itches
jon: ok why are you telling me ?
me : tell your sleezy douche bag mom i said thanks for the crabs!
by vagine ridar January 21, 2008
 
19.
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
 
20.
Little animals found on the beach.
Samantha, don't talk to strangers, you'll get crabs.
by Rob Templin February 13, 2003
 
21.
Abbreviation for Crips Respect All Bloods.
Fakeass gangstaz disrepecting they flags by callin em rags. A rag is something you clean with. Only people carryin em are CRABs.
by CK October 03, 2004