The cooperative act whereby an individual burps and whilst the air is contained in their mouth, they immediately place
their lips around someone’s asshole and proceed to forcefully blow the air into that person’s rectum. At the good judgment of the receiver, that person may release the air as a fart when the time is right. Due to the humid nature of the initial burp and the friction caused during its release along the asshole, the fart tends to be exceptionally loud and attention-grabbing.
Traditionally used in northern Europe to frighten grazing sheep into moving along.