Hungarian Polka
When you are having intercourse doggie style at a tempo of over 200 bpms, and your penis loses control and penetrates the anus and vagina furiously. One experienced in act of the Hungarian Polka can alternate between the two orifices one thrust at a time, without looking.
"While having sex with my wife last night, I was jamming some death metal on my ipod and start doing the Hungarian Polka. However, I accidentally got poo in my wife's vagina and she got vaginitis."