Background: Greasy butter from U of D
Definition: When going down on a girl, pull a stick of butter out of pocket (or some other hiding place). Next, shove the stick of butter in the vaginal cavity. Upon insertion, yell "Land O'Lakes bitch," and promoptly prop your foot over the vaginal cavity while holding the girl's two legs. Continue to hold until the butter is completely melted.
"Yo dude, last night was so crazy. I got so drunk, and I think I gave that wench Doris a Land O'Lakes."