It means no matter how you interpret or express something, it will still result in the same outcome. Moreover, the truth of a statement is not changed or affected by the way a situation is thought about or described. It’s a foregone statement.
"It's been a slice" is a farewell statement that comes from the saying "a slice of heaven." You can use the phrase to tell someone in a playful way that you have enjoyed spending time with them. Also, when ordering pizza, you can also say, "I'll have a slice of heaven please (instead of a slice of pizza)." You will seem much cooler that way.
Act of a male taking his genitals and repetitively moving back and fourth on the female ass crack while moving up to the shoulders, making the female partner aroused.