The compulsive consumption of 3 or more McDonalds Big Macs in one sitting.
1. I had a Macattack on the way home after the football game.
2. We went to McDonalds and Nick had a total Macattack.
When you just ate an excessive amount of McDonald's, and you feel really gross and unhealthy.
Dude are you okay? You don't look too good...
Dude, I'm having a MacAttack. Why did we even get McDonalds ew.