When you are so desperate for attention and a laff from your 5,000 facebook friends you devote 50% of your page trashing someone. All your 5,000 insecure facebook friends think you're a leader, a killer shark, so they following along with all the fun and laffs to gain your approval and friendship!
Shhhhhh...that bitch doesn't even think we are talking about her. No one gives a shit about her, but I'm going to spend my time devoting 50% of my FB page to her and all of you will spend your time reading about her. Man, I hope I get some laffs out of this, because being a Facebook Shark makes me feel important and hopefully feared by others I think are trying to cross me.
by Laff is spelled laugh November 09, 2009

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Top Definition
a Facebook user who logs on and lies in wait for someone else to log on, so that they can immediately trap them in a conversation.
Hm, I think I'll log into Facebook.
2 seconds later:
new message from Jason: HEY!!!!!
Damn, what a Facebook Shark.
by PoisonPen May 23, 2009

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

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A fiercely opionated friend with a voracious appetite for debate. Someone who will pounce on loose comments and opinions and attack without mercy.

Related to:

Facebook Chumming:
The practice of luring friends (Facebook Sharks), by throwing "chum" into the water. Chum usually consists of political or religious comments... far too tempting for a Shark to ignore. The water in this case would be status updates and walls.
When someone knows a Facebook shark is around... making a comment like,

"The Church isn't interested in money or power...."
by NeilPeel December 22, 2010

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt