I've seen the AI say this to me on occasion, but I have no idea what it's talking about. The implication is I was somehow trying to trick it, but I don't think I'd done anything "tricky":
I had sent a medium size force through to a heavily defended AI world, beelined for its command center and destroyed it. My remaining force was getting decimated, so I retreated the few remaining units back to my planet. While fighting the stream of enemies that followed them through, I got that message.
I really like having the AI communicate with the player and wish there was more of it. But I don't know what this means. Any ideas?