Someone or something that makes you happy on a daily basis. Just having that person/thing in your life makes you happy. You think about this person/thing so much that you have to try and stop yourself to be able to focus on other things that require attention in your life. This person/thing is amazing, beautiful and knows how to bring a smile to your face on the darkest of days.

Music so good it could elicit sexual arousal.

A stupid meme that is used on imageboards, such as 4chan and 7chan, that just repeats "the best" over and over again. "The best" is from the song "Best of You" by Foo Fighters.

It is usually used when someone mentions "the best" anywhere in their post.

Also, see when I was.

You.

Someone who is better than others and who is truly more awesome than anybody else

Someone who's really special to you. In your eyes, they are absolutely perfect. Someone who you are extremely lucky to have in your life. They are also a major influence on your happiness, and can make you smile and laugh at almost anytime. They can make the bad days feel ok, the good days even better, and no matter what as long as you're with them, it makes any situation 27000x better. Overall, they are truly the sunshine in your life, making them The Best (and need to realize that soon).

Something that happens when you least expect it