Flush, shit into the flush, flush more if still floating. Noise blocking will never be good enough for the listener to not pick up the faintest signal that can easily be identified as the poodrop and/or fartsounds simply due to circumstantial evidence. If however there is a lot of noise, poodrop and fartsounds are hidden in the noise and cannot be identified. Much better cover-up. 
Flush, shit, flush.
How's this so difficult.