You do me and I'll owe you one.

the thing that you don’t have when you’re phones percentage is over 20

A sexual(often oral) favor performed by someone without receiving the favor in return.

69

Oral sex on a snowman

Gamespot's original score for Shenmue, which later became an in-joke on forums such as Gaming-Age.

The act in which a male proposes a false agreement with a female, in which the female will perform oral sex on the male and the male promises to return the favour, owing her one in the future, thus the name "68". The male then, subsequently, does not return the favour, thus a scam on the female.

The speed limit of sex because at 69, you have to turn around.