I will help you for real.
ACE reliever - I have never heard anybody say this before, but an ace is your best pitcher, so an ace reliever would be your best reliever.
Troll - literal meaning is a mythical creature, internet meaning is someone who lurks message boards and annoys/insults everyone by often pretending to be someone they aren't (such as the dogg/puppy)
Keyboard warrior - someone who says tough things on the internet that they wouldn't say in real life.
I thought tu es maricon was Spanish. It was understood to mean "you are a fag" in English, and that's why everyone was so outraged by it.
Douchebag - literal meaning is some device to clean a vagina, but usually used as an insulting term to describe another person.