Double Eskimo
A sex move guaranteed to result in the woman becoming pregnant with twins.
Dave and Gwen were doing the Double Eskimo... now she's pregnant with twins.
Double Eskimo Sisters
When two women have each slept with two of the same men.
Rachel Uchitel slept with Tiger Woods, who was married to Elin Nordgren, making them Eskimo Sisters. Uchitel also slept with Nordgren's current boyfriend, thus making the two women Double Eskimo Sisters.