Attitude (often motto) present in many elitist or successful groups of people especially at wealthy, elite
private schools, expensive highly-ranked universities, and among
yuppies. Basically means that one works hard at school or their job while they also party on the weekends (or weekdays as well, depending on how far they take it).
Stupid because it basically provides an excuse for mindless partying directing one's life without any space for taking anything seriously in the world.
Sometimes leads to side effects like
alcoholism. Usually outgrown as one gets older.