A member in organized crimes that loans an amount of money to people that are in need of fast, easy money. Loan Sharks tend to be violent if the client does not pay up, also ask for a much higher cash return then what was originally given.
Guy 1: Hey what happened to Louis?

Guy 2: Those Loan Sharks knocked his teeth out, and put his cat in the dishwasher!

Guy 1: He shoulda paid up!
by ElGrego March 13, 2011
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Someone who commits the crime of usury; loans you money and charges extremely (and illegally)high interest on said loan.
James borrowed $100,000 from the loan shark and now he wants $170,000 back.
by James Van Bronsan July 22, 2004
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A person who gives something to another and then takes it back or expects an equivalent in return.
Person 1: Stephanie gave me a book for my birthday, and 3 months later texted me asking for it back.
Person 2: What a Surprise Loan Shark - Leave her on read!
by OnomatoPia October 28, 2020
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The forces that usually plague a person after he or she acquires a considerable sleep debt by sleeping very little (or not at all) for extended periods of time.

Sleep debt loan sharks may use schemes such as spontaneous microsleep, low cognitive capabilities, and (if the sleep debt is extraordinarily high) auditory and visual hallucinations, in order to make a person pay off his or her sleep debt.

As with regular loan sharks, sleep debt loan sharks can be staved off temporarily. In this case, it is through the use of psychostimulants, such as caffeine, amphetamines, ecstasy, cocaine, etc.
Edwin: Hey man, how 'bout you n' me go clubbin' tonight?

Godfrey: Nah man, them sleep debt loan sharks be keepin' me down. Gotta get me some sleep n' sh*t befo' I get real f*cked up.

Edwin: Yo man, two words: Coffee, biotch!
by Double A Tron March 18, 2011
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