Similar to a bubble fart, where the fart slowly creeps out of your ass cheeks but the bubble fart exits a some amount of fecal liquid follows through and down your leg.
When your penis farts, it's a symbolization of horniness. Once that horniness is transferred from your penis, other people can get easily attracted to it. Once they'res 30 people who get attracted to your amazing penis farts, your flagellum starts to fucking explode. Damn! That's hot!
person 1: "hey dude I think I'mgonna have a Penis-Fart!"
person 2: "damn that's hot mmm"
person 3: "UGH DADDY FART IN MY VAGINA AUHGGGGGGGGGG"
person 1: "OH SHIT MY FLAGELLUM AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"