For Steam / Online games that have a virtual economy. When a user takes advantage of a normally new user who is experienced in trading and steals the new user's items by low-balling him less then 20% of the items true value.

Ex. A new user has a item worth 100 usd A sharker adds them and trades his 20 usd item for the new players 100 usd item
Man JhejH PoT is such a sharker he traded his 200 usd item for a 2000 usd one with a noob...
by Hugh Mungus305 December 20, 2017
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a TCG term that describes a person who only enforces rules to his or her advantage.
IMTHEMAN13: omg u cant attack me with that card!!!

the_chosen_giraffe: but you just did the same thing to me

IMTHEMAN13: u shud have said something idiot

the_chosen_giraffe: ok then, you're a sharker
by ojamajoz June 23, 2013
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A dick that hurts going into the vagina, usually influenced by an overdose of viagra, but mine is O'natural.
That man's sharker hurt when it went into my vagina.
by Will Rothperson November 5, 2007
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Le book publishing company of Sean Sharker. You're welcome!

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If I must...

Sean Sharker Publishing Co.
by RevengeOfTheSeph November 22, 2021
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A "Sharker" is a term used by the Roblox Trading Community to call someone who lies about their item's value/other people's items to trick someone into accepting a bad offer as if it was good.
Sharkers usually do that to profit fast, and usually ruin all their reputation.
Very common with rare/semi-rare items, since they're not traded that much and not everyone know how to profit with them.
Roger: Can you accept my trade? My item gets 1 million overpays!
Pedro: Bro, stop SHARKING! You're lying, your item is bad! Sharker!
by orca 0rcl February 22, 2023
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