A pointless, unpleasant activity one is obligated to perform for little or no reward.
From the movie "48 HOURS".
Jack Cates: You been dickin' me around since we started this turd hunt! Only thing you're good for is GAMES. So far, what I got out of you is nothin'.
A journey/Search for knowledge or wisdom
I went on a turd hunt to find the lost city of atlantis.
I couldnt find my shoes so I went on a turd hunt.
I lost my homework and had to go on a turd hunt to find it.
I went on a turd hunt to find the holy grail.