I'm in our apartment, but there are lots of people I don't know there for a photo shoot. I go into the bathroom and find that everyone has been going #2 in there and not flushing, so the toilet is overflowing with....you know what.
Possible interpretation from Dreammoods.com:
To see or come in contact with feces signifies aspects of yourself that are dirty and negative and which you believe to be undesirable and repulsive. You need to acknowledge and express these feelings, even though it may be shameful. Release the negativity in your life. Alternatively, it may also refer to someone who is anal retentive.