Top Definition
Finding out something incredible happened via Facebook. Leaves one in a state of disbelief.
"Dude! I didn't know that Mary and Bill were going out until I saw that Facebook Bombshell!"

"I just checked Facebook and saw that my girlfriend is pregnant. That was a Facebook Bombshell..."

"Turns out my dad is gay. That was Facebook Bombshell I wasn't prepared for."
by Xexeter September 21, 2009
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