i noticed that my amp has slave in and out jacks on the back panel

what does it mean to "slave" two amps together?
you can get them to make toast and coffe for you??
'And after a while, you can work on points for style.
Like the club tie, and the firm handshake,
A certain look in the eye and an easy smile.'

'You have to be trusted by the people that you lie to,
So that when they turn their backs on you,
You'll get the chance to put the knife in.'
Insert your shoelace into the 'in' jack and your particular amp will tie your shoes.
salving is where you use the pre-amp or one amp and the power-amp of another, the pre amp is slaved under the power-amp
Emancipate yourselves from mental slavery, none but ourselves can free our minds.