Online trendy expressions:
People who think it's cute to spell 'probably' 'prolly'. So annoying...
People who can't do simple phonics, so they allow spellcheck to fool them into thinking definitely/def.in.it.el.y could possibly be spelled 'defiantly' (de.fi.ant.ly). Both legitimate words , but very different meanings. (I think they must try to spell it definitaly, and spellcheck offers defiantly as the correct choice. Lack of phonics in Elementary School lets them fall for this.)
Ditto people on political sites , who think secession, secede, succession, and succeed/succede are all the same thing. Four of those are legitimate words-but they are not spelled, pronounced, nor do they mean the same thing. Is spellcheck to blame for people writing succeed in the comments section of an article, the headline of which correctly used secede?
If I were world dictator, using 'amirite?' online would be a capital offense. This is a grating-on-the-last-nerve cutesy way of writing 'am I right?', and I have NEVER seen it used in an online post that didn't make me despise the person using it. It's always used in a snarky, hateful, obnoxious comment.