I think it's special, what's behind your back? (yeah)
So turn around and I'll pick up the slack

from Justin Timberlake (Ft. Timbaland) – Sexy Back Lyrics on Rap Genius

Meaning

So if your backs at the back — your front must be behind your back right?

Apparently JT wants to grab a hold of what’s weighing you down…What a nice guy

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