A radiator knob occurs when a man lathers his gentleman fluid on a cold radiator then turns it on to full. He then invites his baby craving wife into the room who's urge for a baby is so great that she strips and try to catch the evaporating semen vapours with her minge hopefully not singeing her lips on the flaming hot radiator.

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.