The act of placing an orange traffic cone outside of a communal bathroom (with no lock) to warn others that you are taking a shit. The purpose of the cone is three fold. First, to caution others against the foulness which is being perpetrated on the throne. Secondly, to enjoy your poop with out the fear of being intruded on. Thirdly, to give a visual clue to the involuntary bodily response which makes you need to shit more the closer you get to the bathroom.
You can pre-cone (to put a reserve on the bathrrom) or post cone (respect others by leaving the cone in place after you have shat until the smell wafts away).
No-coners show a wanton disrespect toward other patrons of the bathroom and disrespect the policy and those who have worked tirelessly to create the policy in the hopes of shitter harmony.
"I was going to go take a shit but I saw someone coning." "Are you kidding me? Did he just no-cone?"