Sorry. It's an MLism. The day Heath Ledger died, people kept posting it OVER AND OVER. So it means something that is already common knowledge over there.
At least this is still on GBCN. I once referred to something as a Heath IRL. That took some explaining.
I find myself trying to use GBCNisms all the time in emails (such as H for husband or "unity horse" for a point of agreement) and having to edit myself because no one would understand.