Any driver on the road who is first at either a stop sign or a traffic signal, and when given the right of way, just sits and waits for either the road to be clear of all traffic before making the turn, or until another driver behind him "invites" him to make the turn by sounding the horn.

A portmanteau of carpe diem, a Latin phrase that means “Seize the Day!” and DM, which stands for Direct Messages. This word means seizing the day via DMs.