{well, here I am replying some more to my own post(s) -- how ironic...}

jheem chimes in with:
Yes, flatus for 'blowing, gas'. But the final syllables gave me pause for thought. Could it possibly be flatulopoeic 'making gas', mixing Latin and Greek*? ...the (l)opetic part looks more Greek than Latin...

It also seems to me that flatuous (OED) is [a] perfectly good word and has the additional feature of being easily deduced.

*does the term "macaronic" apply here?