Definitions by Dr. UNKNOWN
Lincoln Logging
When 4 men 69 each other in a square. 2 lay on their backs parallel and 2 lay face down on top of them connecting penis to mouth in the 4 corners. The other two lay down on top perpendicular so each dude is connected to two other dudes like Lincoln logs. More floors can be added as long as there are four dudes per floor added.
Lincoln Logging by Dr. UNKNOWN May 25, 2022