Farts that are caused by and are precursors to large doodies.
Doodie barks are a temporary form of relief from the discomfort of having to poop, when dumping is not an option.
They usually smell like the danger ahead.
"Oh dude, that fart smells like shit, gross"
"Yea I've had the doodie barks all morning. Thanks to this conference call I haven't had the chance to drop Obama off in the Oval Office."