Could be the sewer line backing up assuming you are on a sewer or the septic tank might be full or a clog from the house to the tank or jacked up leech(which is really bad).
Yeah that sounds pretty bad if it is all the way to your A/C drain line.Many times in Florida A/C drain lines are separate from the main plumbing for just this reason.
Not an expert in plumbing but I know refrigeration and A/C for the most part.
Or it could be like you say crappy ventilation in the plumbing which means it will happen again and again and again.
Of course once when I a little kid I dunked a magazine in the tub until is was mush and then flushed it down the toilet that went over real well and my dad thought Vietnam was hard.
Maybe you got an alligator stuck up in the sewer line.
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