It's when your farts somewhat resemble the smell of your food you ate a couple of hours ago. There are many different scents to farts depending on what you eat. These kind of farts may smell a little pleasing to you but totally foul to everyone around you.
Food Fart moment:
Dude 1: *Farts* Mmm burrito fart!
Dude 2: OMFG!!! It smells so disgusting! I'm never chilling with you on the days you chose to go to Taco Bell ever again. *Runs out of the room covering his nose*