1. When one of your bros picks up the target that you were going after.
2. Talking bad about one of your friends to the girl he is chasing.
1. "Man, Drew totally mack hacked that blonde away from me. What a dick."
2. "Things were going fine until Ryan came over and started mack hacking. He told her about my other two girlfriends."
© 1999-2015 Urban Dictionary ®
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