Stem-fast 

The world's #1 diet plan bar none. All you need is some crack and a stem to smoke it with. Guaranteed results
but brush those fucking teeth for sure!

Hey ain't dat Lashawnda walkin down da screet?
Yo dats her, but dat bitch dun lost sum ass!
She must be on dat stem-fast diet.

Stem-fast by Jimmy-jam-da-viper-man August 12, 2009

stem fast 

a result of crack addiction where the user neglects food and becomes very thin
(like slim fast, only with a crack stem)

take a look at that skinny motherfucker askin people for change, dude's gotta be on stem fast

stem fast by peanuts and corn May 15, 2006

stemfast

use of cocaine and a glass pipe to loose weight in a rapid time

that chick is got to be on the stemfast

stemfast by Glenn H November 9, 2006