From Urban Dictionary...
http://www.urbandictionary.com/defin...m=eighty-eight
1. eighty-eight 55 up, 18 down
A sex position in which two individuals kneel on all fours with their rear-ends facing one another share a two-headed dildo; the beauty of an eighty-eight (or 88) is that it can be shared by any two people regardless of their respective genders.