Definitions by Eskimo brothers
Lumberjacking
When one guy fucks 2 people of the same family tree. Such as 2 sister's or 2 cousins or any combination people related to each other.
"Dude, I fucked Sara and her sister Courtney"
"I can't believe you are lumberjacking that family tree!"
"I can't believe you are lumberjacking that family tree!"
Lumberjacking by Eskimo brothers June 3, 2017