When one, after finishing high school, decides to (instead of just taking a year off) remove themself from the education system entirely, in order to Live Their Life.
Intrusive Stranger: So, I hear you're finishing high school soon, whatever shall you do with your life?
You: Oh, I'm taking a Gap Life.
Intrusive Stranger: Surely you mean gap year?
You: ...no.
When a man and woman are naked, they are both standing up, the woman has her thighs together, and the guy fucks the gap at the top of her thighs just below her snizz. It works facing each other, or the guy behind.