The act in which you open up the hatchback of one minivan in order to insert the front of another minivan in a gentle yet forceful manner.
Joe: Hey, did you see the back of Billy's town & country? It is wrecked from when him and Jake went minivanning yesterday.
minivanning -noun. the sexual act of inserting two fingers in the vagina and whole fist in the anus simultaneously.
I was minivanning this chick.