1. Refers to the gap between a women's legs that outlines and emphasizes her vagina.
2. A space between a girl's legs where the outline of her vagina is visible. Usually only visible on skinny girls with thin legs and tight jeans. Very noticeable on girls wearing just underwear.
3. The part that you focus on when checking out a skinny, hot chick. Usually aids in the spotting of cameltoe.
Datgap is hot!