After having a long dinner you get back to the bedroom and wanna talk to your girlfriend who keeps complaining she feels really gasy after eating that. She shows you how swollen her belly is from the gas and rips a couple of farts while asking you if you don't feel farty too. It all turns into a competition when she asks that, though, as you say your farts are louder and last longer. It is ON! Let's see which one of you will win in the end ;)