Acronym, 'Not A Lot Going On'. Useful for summing up quiet times/days in online status updates when characters are limited i.e. on Twitter. Particularly favoured by people who consider it will be of interest to their friends & followers to know that there is Not A Lot Going On, whoever these people are.
E.g: 'Boring day at work. NALGO.' 'X is juz chillin on the beach today, NALGO.'
Can also be used ironically: 'Guy just got run over by a car outside the office, ambulances and police everywhere. NALGO.'