The border that distinguishes whether or not the high difficulty of a video game makes the game "challenging but rewarding" or "frustrating and unrewarding."
"Finally, after much frustration and about 900 attempts, I've gotten the core on the ropes and I'm moments from landing the final blow, whereupon I glitch through the floor and fall to my death. No. That's too much. That's gone right over the Tropic of Fuckabout on a jet-ski full of dicks. I'm done. Fuck The Surge, fuck Deck13, fuck anyone who likes it. Blimey, that's filled my schedule out for the week."
-- Zero Punctuation
According to Stephen King in Dreamcatcher, fuckaroo means an extremely fucked up situtation, as opposed to fuckaree which means having a great time, usually but not necessarily, sexual.