The phrase
"fucking reason" is a strong expression used to convey frustration or disbelief about something that doesn't make sense or has no understandable explanation.
Full definition
Except for
some fucking reason they felt a true freshman QB was the best runner.
Our 3 pt shooting has magically disappeared for
some fucking reason.
She continues, with mounting anger, «I keep looking for a reason... If you want to see me do it, you have to tell me why; give
me a fucking reason!»
Ejiofor and Stan and Damon and Chastain and Bean and Peña and Mara and Donald Glover and Kristen Wiig for
some fucking reason?!
At least, we all want the Silver membership to allow free online gaming, since, you know, there is
no fucking reason why it shouldn't, right?