meaning: stands for Operasi burung hantu( Malay Language) or Operation Night Owl, is a term giving to those working/staying up late in the wee hours of the morning, just like what on owl would do.
example of usage:
person A: " WAh !!! you look tired and your eye-bags are protruding...You must be doing some 'Operasi Burung Hantu' this morninng".
person B: "hahahahaahh!! yes I did. I couldn't sleep because of some unfinished assignment from my lecturer.