Act is short for ACTually. It is only used in the indirect questionative form, meaning it is only used to question something someone says but not really looking for an answer.
Person A: Yo that fly hunnies diggin` yo phat ride!
You: ACT?

Just like saying "Really?".
by J master flex November 01, 2005

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.