A better way of saying more serious, as its shorter and definitely much easier to say. It also saves room on tweets.

When you're full full serious.

Used to back up a statement that is strongly true.

Noun form of adjective serious

asking a question, slang word for emotion thats serious

really telling the truth.

This term is usually used after saying a non-intended humorous quote or phrase.

This term can also be used to put a serious twist on your joke, and frequently intensifies the situation.

It is also used to make a joke more humorous, this is called backing-up(usually used after your not-so-funny-joke)