The process of cupping your hand against your ass while emiting flatulence and then holding the gas in your hand while bring it to another person's face and letting them inhale. Inhalee may or may not enjoy.
I took a look into his marathon times, and when he sped up from 7 minutes per mile in the first half of the race to 5 minutes per mile for the second half of the race, it was very clear he kipped the course. The race director did disqualify.