When a man inserts one end of a hamster tunnel into his asshole and the other end into the other male/females asshole. Then letting off a huge fart. Therefore sending his fart to the other person.
Toby: Jake do you wanna shuttle again?
Jake: Oh yeah, shuttle me, baby.
Toby: Good because I've been holding in this huge fart all day just for you ;)
Jake: I love shuttling with you Toby ;)
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