A planned vacation made ahead of time to meet a girl for the purposes of having a week-long marathon of sex. Usually a common practice with long-distance relationships.
Arnaldo: I am so stressed from work and I haven't had sex in weeks.
Peter: Don't you have a girlfriend?
Arnaldo: Yeah but she lives in New York.
Peter: You should plan a fuckcation.
this is a feeling or object that is so epic that even the word epicnessicity fails to describe it, this is something that is godlike and willnever fail at life like the things it destroys in its epicness, and gracefulness.