X marks the spot

[Donald Trump]

What is said upon finding your target has been marked out. Derived from an X on pirate treasure maps. The phrase was put into common usage by the British army, who performed executions by marking a piece of paper with a black x and positioning it on the heart of someone sentenced to death.
The acting officer would say X marks the spot and the firing squad would shoot the x.

[Little_Girl]

This is the exact location (from the act of using an x to mark a location on a map)

[Little_Girl]

You let cookies and cream ice cream melt in your mouth, reserving a large cookie piece. Each person in the circle sticks out their tongues and the person with the largest cookie piece, or x marks the spot, wins the round.

[Tina]

This is when you bury some poor soul in the sand usually at the beach with their face exposed then you drop your drawers and you take a huge shit on their face.

[Tanya Shivari]

a sexual position where an individual lays on the ground and makes an x with his or her body.

then inserts each of his or her hands and feet into four consenting women.

[Becky]

shaving ones pubes like an X