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 ;)