When you are in a dangerous situation i.e. the danger zone

A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.

A zone of danger.

When you’re stalking someone’s pictures on social media and accidentally go back to when he/she was underage.

The state of being in which you are so drunk that one or more of the following may occur: 1) Trouble speaking/walking 2) Throwing up 3) Being incapable of making simple decisions.
People in the danger zone are beyond being wavey yet are not quite drunk enough to need to go home.

The point of male masturbation between ejaculation and semen disposal in which, if someone were to walk in, you would no longer be able to deny them clarification of your masturbation.

The last pockets of gas in the colon before the creamy goodness emerges from the stinkhole.