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.
The state of being frosted (angry) and frustrated at the same time.
Matthew was in a state of frostration when his boat sprung a leak. He was frostrated when his girl friend stood him up. It is a frostrating experience to have your wallet stolen.