We ain't rapped too tight
Follow up to the previous line. If a “new body” (somebody) was sleeping with “old heaters” in their house, they would be as could as if they didn’t wrap their sheets tightly around them when they sleep. Furthermore, Budden could be also be using the line to suggest that because they aren’t “wrapped to tight” they have a screw loose and are insane.
To help improve the meaning of these lyrics, visit “Die” by Slaughterhouse Lyrics and leave a comment on the lyrics box