just built a tree fort

An inconspicuous term used to notify friends that you had intercourse for a long period of time. That you figuratively just "camped-out" at her "site".

(aka= was building a tree fort)

GUY1: "So what did you do last weekend?"
GUY2: "well, not much. . . just built a tree fort"

by Tomchew87 October 2, 2014