Adjective used to describe usually very negative person, that bitch about everything, spread unnecessary hate or just talk shit about others. You can meet these people in any online game comunity and they are the main coin of online gaming.

Used to describe a person who is tainted by a subconscious malevolence or psychosis that affects the lifes of those who come into contact with them.

Toxic is a group of people who are rude and can't be nice. They are not true to people around them. They need an attitude check. Their personalities are so unappealing its make the people around them suffer and turn rude as well. Beware of toxics!

Toxic means poisonous, a person who is poisonous gives you “good enough” love and takes your great love for granite.

It is where someone is such an asshole you cannot deal with it. They talk shit about you and others, and if you get into an argument, you are the one blamed for it and they always win. They need an attitude check. Their names are usually Jessica, Edward, Karen or Callan. They want to be in charge of what you do, what you say, and even what you think. They freak out when you disagree with them, and won’t stop trying to convince you that they are right and you should do what they say.

A word used to describe a person spreads unnecessary hate on an online community

A severely overused buzzword (similar to 'like') which is commonly used by people who are unable to have an actual argument, commonly used in the online community. This is probably used because it's much easier to get people to join your side when you call someone Toxic, rather than saying "X hurts my feelings" or "X is annoying."