Here in the Philippines, this was never a trend. But due to my wide existence of virtual knowledge (chos!) I have encountered these three unknown letters. And so forth, it came Hit Me Up on Google Searches.
Due to the fact that during summer months that students do not have the pressure of attending school, they flirt around. They tag HMU on their statuses pranting their hormones that tis’ the mating season. This was also a trend on Fridays and weekends (even during normal season) because people get a chance to flaunt in bars and clubs.
I would tend not to disagree that this would be a trend in the Philippines soon.