To be overly offended/emotional over a post/status/picture online, or over something trivial in real life. To be overly sensitive to shit that has nothing to do with you.
You don't like a post on Facebook, it really offends you, so instead of being an adult and unliking a page or moving on with your day, you become all homotional and bitch, whine and complain to everyone who will listen on said page.
Expressing Heamotion or Heavy emotions. This is often used to describe an extremely Emo person. It is a very disparaging an insulting term. Rather than to call a person Emo, you call them Heamo because they are acting so outrageous and starved for attention that it requires a much stronger terminology.
Heather was acting very heamotional over the spat with John last night.