A very distinct gastrointestinal discharge of air/gas of different content, methane is one of the prime constituents. Typical odour is created or manifested from consumption of certain foods such as broccoli, beef, and cabbage, cheese, as well as certain beers. While the processes involved in the digestion of such foods...and...the odour produced is not well studied, the odour is commonly recognized by the average citizen and acknowledged as a "beefy fart" by "slacker" types of the youth demographic in the majority and many others.
Damn, he must've had beef and cheese sticks with beer last night, those beefy farts were horrendous.
Fart, breaking wind, gas, assgass, blowing ass