I have only just become aware of Purple Drank, it's been around for a few years and it sends "niggas flying", it's pretty big in the states with the southern rap movement etc. Apparently Lil Wayne has become addicted to it, so thats pretty cool I guess.
'In addition to its popularization in the music of DJ Screw and Three 6 Mafia, the mixture has been referenced in lyrics of other rappers. It is the subject of UGK's "Sippin and Spinnin" and "Purple Drank", as well as tracks by Big Moe, Paul Wall, Mike Jones, T.I., Lil' Flip, Lil' Wayne, Fat Joe, Three Six Mafia, Beanie Sigel, Project Pat, Chamillionaire, Slim Thug, Fat Pat, Frayser Boy, Z-Ro, Kanye West, Youngbloodz and Trae.
In a flow freestyle featuring Lil Keke, Paul Wall states that he is, "High as a kite on cloud nine, I'm leanin' tough and movin' slow. I'm fightin' sleep and dozin' off, sippin' this drank to cure my cough, I can't think my mind is blank, pardon me but I'm throwed off."
New Orleans rapper Lil' Wayne frequently mentions drinking purple drank. In the Duffle Bag Boy music video he can be seen holding a Styrofoam cup with "RIP DJ Screw" written on it. In the remix to "Throw Some D's" on his mixtape Da Drought 3 he claims "I'm not a rookie, I'm a pro..methazine fiend" as well as stating "You know what's in my Styrofoam...what? S-Y-R-UP." He also mentions the substance in the song DJ Khaled's "We Takin' Over," saying "I like my Sprite Easter pink," and in the track "Barry Bonds" from Kanye West's Graduation album, "My drink is still pinker than the Easter Rabbit", overt references to the color of the beverage. In the album Tha Carter III, the song "Phone Home", includes the lyrics "I'm used to promethazine, in two cups, I'm screwed up". His song "Me and My Drank" is dedicated to his use of purple drank and the song "Kush" mentions purple drank in the line "Keep a bandanna like the Ninja Turtles, I'm like a turtle, when I sip the purple."
The substance is being mentioned in lyrics of other musical genres. Southern punk band Black Lips' song I Saw A Ghost (Lean) is about a trip on purple drank.'
My conclusion, it looks really funny.