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

Excellent! Very good!(Australian slang)

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.

ace is a mothafuckin awesome ass person, that's nice & keeps it 1hunnid

Exclamation that expresses something as being exceedingly good.

The god of all gods, we don't know how that majestic man birthed Zach,also his wife fingers his sons butthole