When engaging in sexual intercourse, the woman engages the male sexually, getting him to feel like he is going to ejaculate. She speeds up really quickly, like that of a car before the a yellow light, but then right before he releases, she stops, similar to a car once the light turns red and it hasn't made the intersection.
Person 1: "Yo I hate that girl man; last week when she was givin' me dome, she was totally yellow-lighting me!"
Person 2: "Nah dude I don't mess with girls like that, like Kanye and Taylor, she always let's me finish."