In everyday folklore, a barking spider is the supposed source of an otherwise unexplained fart. The joke works because the sound is instantly recognisable and the creature is remarkably difficult to produce on demand. The recordings here are sound effects that illustrate that usage. Real Australian tarantulas also have regional names including barking and whistling spiders; their defensive stridulation is a different subject.
A short rasp beneath a chair. A rolling rumble in a quiet room. Barking spider is the wonderfully convenient name given to these encounters. This reference brings the recordings together, with descriptions that help you tell a brief bark from a sustained one.