I have installed a new mobile browser and realised it was not that easy to manually add my above user CSS.
So I have saved it in my konami-command repo as metabrainz-discourse_EXPAND-ABBREVIATIONS.user.css file that anyone can now install by clicking the Raw button.
Here is a test, to see if it works, click that abbreviation: LOL. 
Oh, we don’t have this one.
Test 2: MBS.