A shooting star nut is when you're having sex outside, with a clear sky so you can see the stars. To accomplish this move you need to pull out and cum at the exact moment a shooting star passes over above you.
Refusing to commit to a plan in an attempt to leave one's options open in case something better comes along.
Charlie invited Kelsey to dinner. She didn't refuse nor accept his offer, but instead decided to do some plan shopping in case something more exciting came up.