verb, dumpnapped, dumpnap•ping, noun
a brief period of sleep on the toilet whilst taking a dump, commonly one taken during the daytime (usually occurs during extreme states of tiredness and/or drunkenness): I dumpnapped the afternoon away.
man 2: "I was gonna take a dumpnap"
man 1: "AH! Gotcha. That's cool, I'll just catch up with you later then"