someone who is really close to you.
someone you can relate to.
someone that you can easily talk to.
someone who listens.
someone who really care for you.
someone who share the same interests.

To be boss at somethin; To be extremely good with/at.

To destroy an enemy team in an online game.

Specifically, the entire team on your own.

For lesser degrees of victory, see: owned pwned

To do a task perfectly

AC is usually said in vine edits and it stands for "Audio Credit"

Asexual to any degree. Using "ace" for "asexual" gained popularity on AVEN (www.asexuality.org) and has inspired the use of the spade as a symbol of the asexual community.

When a baseball pitcher is dominating; on top of his game.