A group sex position where couples are stacked on top of each other 69ing. It can either be in the stacked form (where you are just with one partner, but there is another person perpendicularly stacked between you) or the square form (where each person eats a different person in the square).
We had so many people doing a Lincoln Log 69 last night I thought we were gonna topple over like a game of Jenga!
by Pupu Peepee October 15, 2007