Verb - To convince friends to come over to your computer while looking up old classmates on Facebook. Then you leave a grenade. After leaving a "grenade" also known as deadly fart, your friends start throwing up everywhere
I was on Facebook after drinking and smoking looking up Angelo Portale while shitting my pants, I left The Facebook Grenade behind, I called my friends over and when they dashed over, (comma) they inhaled through their nose my noxious gas I left lingering in the air.
by John Amsterdam December 27, 2010
A man or woman that looks extremely good in their photos on facebook, but in person is extremely ugly. Easily fooled by teenagers. Original pictures often changed by editing or "piknicking" the photo.
Sawyer: Dude, this chick looks so hot in her facebook pictures.
Peter: Don't even bother man, I thought the same thing until I met her in person.
Vaughn: Guys, she's a Facebook grenade.
Peter: Don't even bother man, I thought the same thing until I met her in person.
Vaughn: Guys, she's a Facebook grenade.
by Let it rain Mcilvain January 8, 2011
A person that is not your significant other that you are friends with on Facebook that is always liking/commenting on everything that you write regardless of if it is something that they find amusing or interesting. Originated by Steven Garcia
Man I got this Facebook Grenade that has been liking and commenting on everything that I put on Facebook!
by lilg210 October 27, 2011
A post on Facebook that is controversial and provokes a powerful response. You make the post, then wait for the proverbial explosion.
I have a controversial opinion on who is the greatest badminton player of all time, and wanted to start a discussion, so I dropped a Facebook grenade and waited for people to tell me why I was wrong.
by AcesWild212 January 8, 2021