I think ACDC can explain this better than I

Back in black
I hit the sack [I hate to say]
I've been too long I'm glad to be back [I bet you know my recipe pack]
Yes, I'm let loose
From the noose
That's kept me hanging about
I've been looking at the sky [A little lickin' on the side]
'Cause it's gettin' me high [just a gettin' me high]
Forget the hearse 'cause I never die
I got nine lives
Cat size [cat's eyes]
Abusin' every one of them and running wild [Cruisin' every woman, never wonderin' why]

CHORUS:
'Cause I'm back
Yes, I'm back
Well, I'm back
Yes, I'm back
Well, I'm back, back
(Well) I'm back in black
Yes, I'm back in black

Back in the back
Of a Cadillac
Number one with a bullet, I'm a power pack
Yes, I'm in a bang (Yes, I give a bang]
With a gang
They've got to catch me if they want me to hang
Cause I'm back on the track
And I'm beatin' the flack
Nobody's gonna get me on another rap
So look at me now
I'm just makin' my play [pay]
Don't try to push your luck, just get out of my way

CHORUS

Well, I'm back, Yes I'm back
Well, I'm back, Yes I'm back
Well, I'm back, back
Well I'm back in black
Yes I'm back in black

hooo yeah
Ohh yeah
Yes I am
Oooh yeah, yeah Oh yeah
Back in now
Well I'm back, I'm back
Back, I'm back
Back, I'm back
Back, I'm back
Back, I'm back
Back
Back in black
Yes I'm back in black

Out of the sight [sack]