Mountain Dew makes your penis small anyway. Fuck Moutain Dew and PepsiCo.
First of all, I write this with contempt and absolutely no respect for your very existence, and the existence of every other dick-sucking faggot homo that goes to the levels of stannery that you and others like you go to.
Secondly, do you also believe in Big Foot? The Lochness Monster? Yeti's? Fairies? Or Lil Wayne having classic albums? B/c they all have one thing in common. They don't exist. They're all figments of your imagination.
The word was that Mountain Dew didn't make your penis smaller. It made your testicles smaller. A rumour that was false. And wasn't even about Mountain Dew, but about the Yellow No. 5 food colouring in Mountain Dew. The same that was in Mello Yellow (hence, Mello Yellow having the same rumours about it).
None of those were true. If that were the case, you'd have to stop eating a bunch of foods, like Corn Flakes, yellow gummi bears, yellow gatorade, yellow powerade, yellow-colored Kool-Aid, yellow jell-o, risotto rice, some Doritos and Nacho chips, pickles, Kraft Dinner, etc.
You're more likely to get an allergic reaction from that yellow dye. Actually...you're more likely to find a coherent Lil Wayne verse about something other than money, pussy, and drugs than you are likely to have your balls shrunk from Mountain Dew.