It refers to the fart-like sounds occuring during the anal sex. If you say sb has got the fart in the hole, it means that s/he is in a really sticky situation.
A few hours ago, your boogie pimp Jim has learned that he is HIV+, which means you really got the fart in the hole now.
When someone rips a gnarly fart, and it's so thick in the air, that you can cut it like butter. Fart butter is the suggested topping for an air biscuit.
(andy)What the fuck is that smell?
(dick)I don't know what you're talking about.
(andy)Dude, you dropped some serious fartbutter in here.
(dick)I don't smell anything; it must be the sewer again.
When you fart and you walk away from it for a while but evertime you pass that section the fart is still lingering in the same exact spot.
joe:*farts*
kuro:ew D:
Joe: *walks away from fart* 8]
kuro: walks away
Joe: *goes to the bathroom*
*2 mins later*
kuro: *passes spot joe was staning in* holy sit dude yer fart is still standing here!