My adult male once did something similar.
This happened after he consumed a slightly larger then usual rat. Spent a few days soaking which i guessed was a result of feeling very full.
Roughly a week after the meal, one night i was woken to a similar "farting" sound. I also got the fright of my life at first.
Turned out to be a large poo, along with loads of liquid. His behavior , normal as always.
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