When you have been on a dry spell for some time and you suddenly smash multiple women within a small timeframe.
Also: That time of the year when they gonna learn.
This word was first used for the moment a good day turns bad ("ahh there it is the fuckening"). Now it can also be the moment a movie turns woke, often preceded by early signs.
"Wow, that is such a cool guy!"
"Hmm, he is a bit too cool, suspicious..."
(Cool guy starts making our with another man)
"Ahh there you have it, the fuckening. This is another pro-LGBT-propaganda movie."
When you have had multiple great days without issue and like the fuckening feel like something is bound to gowrong except that it doesn't for a few days and the fucking energy builds up to turn a minor inconvenience into a major inconvenience
(said during said not so minor inconvenience happens) "Behold, the cluster fuckening"