2 by 4

I'm Al Green
I'm Shug Knight
I'm a time machine.
I'm a fistfight.
I'm a big deal.
I'm a closed door.
I'm looking out for you.
I've been here before.
I'm a slow fuse.
A 6 ft. 2 by 4.
I'm the best damn friend that you don't have no more.