Lol, mine does that. Anytime I'm sitting around and start thinking about leaving, here he comes from another room waggin his tail looking at me and the door. He's even come out of sleep if start thinking about food or leaving.

Dog is part of you. He is part of your subconscious. There is a reason they are "Mans best friend"

yodel a few times randomly to throw him off his game

hah how can you tell?

It's subtle, subconscious cues that you're giving off which he is able to pick up on. When you get up for food, you carry yourself differently than when you get up for a piss. Your dog is bonded with you, watched you enough to the point where he sees all of your movements in a way I don't think we can conceive as humans.

Don't ever try to lie to him. He'll know.

My cats are the same. I talk to myself all day. They've learned a lot of key words.

"I gotta peeeee!!!" and the one obsessed with being in the bathroom with me runs to the bathroom before I even stand up from my chair.

The one who likes to go in my vocal booth with me knows the word "record" and will come flying from anywhere in the apartment to settle in there.

All 5 of my Dogs also know the differences lol. Quite annoying.