The phrase "old crap" refers to things or belongings that are no longer needed or useful and are considered worth discarding or getting rid of because they are outdated or useless.
Last time I had a dream about this subject where I was preaching a message but I did not want to use the same old crap for salvation. (redeeminggod.com)
And then my blood pressure went up as a shit load of old crap flooded back to mind. (nakedpastor.com)