Lumping can be done by oneself on objects other than a person for example cushions/floor, but research has shown it is most comfortable when done on another person.
2.The act of a human or animal squatting out of pain to use the bathroom at a bad time.
2. Out of excruciating pain and prevalence, the man was left lumping in the bathroom line.
The opposite of flossing.
From the verb "To Lump"