A seemingly never-ending succession of farts, lined up in a geometric or linear pattern.
Gee Bob, did you see Jim and his fartstack earlier today? I thought it would never end.
by Phil Saberhagen January 17, 2004
A tower of farts, like piled pancakes or smokestacks. Moreover, someone who's noxious, unbearable, and downright disgusting.
"Your mom is a fart stack."

"Ugh, I laid the most rancid fart stack earlier."
by Narwhal Rider March 02, 2009

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