A courtesy warning issued to a companion while walking that there is, in fact, a turd ahead in their trajectory.
Bro, I'm not sure if that was human or dog, but thanks to your Turd Alert, I didn't have to find out the hard way!
An email message sent to your circle of friends at work after the discovery of brown matter that didn't quite make it into the toilet bowl.
TURD ALERT … TURD ALERT … TURD ALERT
Alert Level: brown
Location: first stall, ladies room
Status: uncomfirmed (sorry, even with contacts I can’t identify suspect 100%)
MO: inconspicuously positioned to the left side of porcelain goddess; proceed with caution, and avoid stall numero uno at all costs