1.(noun): Zachary "Zack" Morris, the main character from "Saved by the Bell"
2.(verb): The act of doing something very outlandish and/or surprising that brings great joy to many people. (It can only be done by someone named Zack, Zach, Zak, etc.)
3.(noun): A nickname given to any "Zack" who is viewed as spontaneous or unpredictable by his peers.
Zach Attack: Hey, Mr. Belding. What brings you to study hall?
Mr. Richard Belding: Don't get cocky, Morris. I've got my eye on you.
Zach Attack: Sorry, sir... You're not my type.
Guy #1: This party sucks, they're already out of beer!
Guy #2: Are you kidding!? Wow, let's get out of here...
(Zack enters with a keg, a 30pack of Bud, and a funnel)
Guys #1+2: NOW THAT'S WHAT I CALL A ZACH ATTACK!!!
Girl #1: Hey, have you seen Zach anywhere? He promised me we'd dance tonight!
Guy: Oh, Zach Attack? Yeah, he's either in the living room playing pong or outside jousting on that Big Wheel he bought on eBay last week.
(Girl #2 enters laughing hysterically)
Girl #2: Everybody come quick! Zach Attack's on the roof throwing Jawbreakers at the Trick or Treaters!