You'd be more likely to use tachmoH than yoymoH when moving someone from a prone to a supine position. And you'd be more likely to use yoymoH than tachmoH when flipping over hamburgers or pancakes. On the other hand, either would be fine for flipping over cards, with yoymoH implying a quicker or crisper action. I can imagine in a Kalibo show, there might be an opportunity to use tach without the -moH!

Lieven and Okrand

MO said okay for these examples I wrote:

If the wind blows and a sheet of paper just moves upside down, assuming it does not fly away: tach nav and nav tachmoH SuS

Okrand wrote that tachmoH is used "when moving someone from a prone to a supine position." -- Of course, it also works the other way around. Additionally, this was only an example. The verb is NOT limited to bodies.

If you turn around in your bed, you'd say jItach.

For the suggested jItach'eghmoH, Okrand wrote:

"Normally, the first. You could use jItach'eghmoH if there were a particular struggle or effort or accomplishment or something like that involved, something that might prevent you from turning yourself over or that's making it particularly hard to do."

I asked why yoy is used for pancakes, since they have equal sides, so there is no defined "top".

MO said:

"Unless you're drawing pictures or writing on the hamburger or pancake, you're right -- there's no official top.  But when you flip the hamburger over, the side that was face up is now face down. It may sound odd to say it's now upside-down, but it's definitely flipped over.

Similarly, if you turn it over again, it's weird to say it's right-side up, but it's definitely been flipped over.  The gloss in boQwI' for yoymoH is pretty good: "turn upside-down, flip, invert.""

I wrote:

I think that a yoy human would be head down, feet in the air. Somehow, "upside down" sounds like when something is /incorrectly/aligned, not just turned around like a pancake, is it? 

MO said:

"You're right about that poor human (unless you're talking about an acrobat or something like that, in which case he or she is not poor at all). yoy is not just for flat (or flat-ish) things.  Rather than considering the upside-down orientation to be "incorrect," though, perhaps think of it as "not the norm, not usual, not customary" or something along those lines."

If there is a separate tach (bar), the chom (bartender) will mix drinks; otherwise, the chores fall to the vutwI'.

If the restaurant is large enough to have a separate tach, the dining party, upon completion of the meal, is likely to move to the bar and continue drinking and, probably, toasting and singing. In a smaller establishment, diners tend to remain at the table for quite a while.