A massive fart. So named because you must lift up one of your legs to properly release the pressure.
Guy1: "Where did you go?"
Guy2: "I went into the bathroom to release a massive leg-lifter"
Guy1: "Good thing you went into the other room"
A fart. So named because you blame the resulting smell and sound on the fictitious spider. Most often referenced as being stepped on when the term is used.
*fart noise*
(pause)
Innocent Bystander: "Oh man, what is that smell?; Did you fart?"
Guilty Party: "Ah, no, man, You must have stepped on a barking skunk spider"
1👍 1👎