A sometimes loud, always odorous, expulsion from the butt which occurs while sleeping. Also see fart.
Woman: I hardly slept at all last night.
Man: Why? Was I snoring?
Woman: Not exactly. You were butt snoring, which is why I ended up sleeping in the guest room.
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wife: ew did you just fart?
husband: nah hun, was a butt snore.
When a fat guy goes to sleep and farts then sucks it back up.
His butt snores only smelled for a second, as he sucked them back up.