And I can't feel my limbs cause
Em’s limbs are “numb”. This leads into the Hook and also happens to be the title of the track.
Also referring to the previous lines. Em’s got his clothes off, when you’re cold it causes you to go numb!
To help improve the meaning of these lyrics, visit "Numb" by Rihanna (Ft. Eminem) Lyrics and leave a comment on the lyrics box