Like fornication but
inside of a fort or fort-like structure.
eg. Blanket fort, tree house, refrigerator
box, etc.
Michelle: I hear
Steve and
Andrea are building a fort instead of coming out tonight.
Leanne: Oh yeah? Sounds like they'll be into some serious fortication this weekend.
Michelle: Truth. If the refrigerator
box is a rockin, don't come a knockin.