When you and your partner discuss at long the intentions of your sexual persuits right before you make love. Then at the last second the male abandons all this and screams, "Leeroy Jenkins!" and just penetrates and goes to town.
We spent an hour cuddling and "planning" last night before me and my wife were going to do it. Then right when she was ready to start pulled The Leeroy Jenkins, screwed the plan and went right in!