The act of waking up late in the clothes from the previous day and continuing to wear them, not shaving, skip showering and most other daily hygiene practices, then interacting socially or to go into public for a majority of the day (may also be a state of being, and normally a person will enter bum mode in the presence of good friends)
causes can be sleep deprivation, hangover, late night of work or gaming, and/or just plain laziness.
“For almost every day last month Malaysian artist/architect Hong Yi (who often goes by the nickname Red) created a fun illustration made with common (and occasionally not so common) food. Her parameters were simple: the image had to be comprised entirely of food and the only backdrop could be a white plate. With that in mind Yi set out to create landscapes, animals, homages to pop culture, and even a multi-frame telling of the three little pigs. The project, which still appears to be ongoing, has been documented heavily around the web.”