Eiffel sixty-nine

When you have a foursome (at least) where two people engage in 69 and two people deliver penetration to the 69ing participants at the same time. Nice. An advanced Eiffel Tower. Way different from Eiffel 65 except for the part where someone might turn blue da bu dee da ba di

I'm sorry Sarah, this is an Eiffel sixty-nine. Next time bring a friend