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1.
A fart so heinous, that it smells like the undead. Follows the issuer around like a zombie and generally sticks to everything in the room, consuming it with it's stink.
"Ok, who let out the fombie? Seriously, it smells so bad, my cat just barfed."
by DannoPMan October 23, 2011
 
2.
A old post on facebook that is resurrected by a person liking, or commenting on the post, in the way a zombie is resurrected from the dead.
Oh my god that fombie is too funny! It's like a frape, but better because he actually wrote it!

Let's fombie her! She used to be so loose in 2009, it will be outrageous.
by georgiaalicecargill September 17, 2013