The crab louse (Pthirus pubis, also pubic louse) is an insect that is an obligate ectoparasite of humans, feeding exclusively on blood. The crab louse usually is found in the person's pubic hair. Although the louse cannot jump, it can also live in other areas of the body that are covered with coarse hair, such as the eyelashes. Humans are the only known hosts of the crab louse, although a closely related species, Pthirus gorillae, infects gorilla populations. The human parasite diverged from Pthirus gorillae approximately 3.3 million years ago.
An adult crab louse is about 1.3–2 mm long (slightly smaller than the body louse and head louse), and can be distinguished from those other species by its almost round body. Another distinguishing feature is that the rearmost two pairs of legs of a crab louse are much thicker than the front legs and have large claws.
The eggs of the crab louse are laid usually on the coarse hairs of the genital and perianal regions of the human body. Crab lice may also be found on other areas of the body that have coarse and relatively sparse coverings of hair, such as the beard, moustache, eyelashes, underneath the arms. They do not generally occur on the finer hair of the scalp.
(Parody of Deck the Halls)
Grab your balls like Michael Jackson
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Add some pelvic thrusting action
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Don we now our leather jackets
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Pick that crowbar up and whack it
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Rip your shirt off
Show some nipple
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Squeeze your buns
like Mr. Whipple
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You'll always get a big reaction
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If you grab your balls like Michael Jackson
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Merry Christmas Bubbles
Grab your balls like Michael Jackson