Extremely tired or exhausted. After the long hike, I was completely whacked and just wanted to sleep.
Strange or crazy, often in a humorous or eccentric way. His whacked sense of humor always made us laugh at the most unexpected times.
Under the influence of drugs or alcohol; intoxicated. He looked completely whacked after the party.
Broken, damaged, or not functioning properly. I think the remote is whacked; the buttons don't respond.