Bouncing, interpreted strictly, refers to masking your IP on IRC by going through a different host which is running such software (bnc). It is widely used innocuously.
I suppose it can also encompass alternative ways of hiding your IP by going through separate machines, but I think the author of the document would have said so explicitly considering he's used proper terminology elsewhere ("vpn", "proxy").
Thanks, pero, for the succinct and informative response. Do you have an email? I searched "eychqu" and found a web design firm based in Toronto. I'm assuming you run it?
I suppose it can also encompass alternative ways of hiding your IP by going through separate machines, but I think the author of the document would have said so explicitly considering he's used proper terminology elsewhere ("vpn", "proxy").