little nod and a wink

UFO bassist Pete Way recalls thinking AC/DC – the brothers in particular – were ‘going out of there to absolutely kill us every night. You know, support bands don’t usually admit they’re trying to blow the headliners off the stage, but Malcolm, especially, didn’t bother to hide it. He wouldn’t even look at you before they went on. Even Bon, who’d be hanging out in our dressing room most nights, he’d give that little nod and a wink but you knew as soon as he went out there he didn’t give a **** about you. They were gonna steal the rug from under you first chance they got.’
1. What does going out of there mean?
2. Who does you refer to?
3. What does he’d give that little nod and a wink mean in this context in other words?