1. When one of
McDonald's foods, drinks, products etc. somehow invades
the public in a way that says, "I'm lovin' it".
2. When you feel sick after eating
something from McDonald.
1. I'm walking
down the road one day and I see a Ronaldmobile
drive by...
you know a Mctack is coming.
2. After eating two Big macs, drinking two cokes, and 3 medium orders of fries, I think a Mctack is going to happen.