Commonly used in text messages or social media as a short form for Very Sound Advice.

Say it to someone who has an extremely ginormous forehead

When you see a hot girl and you want her to do you, you lay down on the ground on your back, you bring your feet up past your head (so your crotch is in your face) and you have your butt facing up, you put both hands on your butt cheeks, and rock forward and back screaming "Deh, Deh!" Then you jump up and scream "Do Me!"