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
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Jul 15 Word of the Day
The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.
Billionaires are having a dick swinging space race while the earth experiences record breaking heatwaves that cause sea creatures to literally cook inside their shells. We need planetary quarantine.
by monkeylabor July 14, 2021
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2
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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3
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
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