What does it mean if I say I don't like the people Dave "hangs around with"?

I don't like the people that Dave spends time socialising with.

What does it mean if I "outstay my welcome"?

What does it mean if I "hobnob with" my boss?

I attend a lot of work meetings with my boss.

I am friendly with my boss because I think he/she is an important person.

What does it mean if your new work colleagues are "cliquey"?

They spend a lot of time together and don't let anyone new join them.

They are very friendly and want you to socialise with them.

They don't have any time to socialise and focus on work.

What does it mean if you "rub shoulders with" important people?

You often throw parties for important people.

You often meet or talk to important people at social events.