Refers to the size of a woman.
Stem: Really fucking skinny (anorexic/bulimic) ex. Nicole Richie
Twig: Model skinny. ex. Adrianna Lima
Stick: Properly sized and proportioned. ex. Jessica Biel
Branch: Thick. ex. America Ferera
Trunk: Big like a Ford F-550. ex. Rosie O'Donnell
Man 1: On the tree scale what would you rate your girlfriend
Man 2: Dude, my girl is HUGE she would be the trunk.