I like how in every other profession if something doesn't work it's called a mistake or a fuck-up but in software development it's called a bug and it is absolutely expected.

Oh believe me I have seen plenty of code I would consider a fuck up.

A bug is when something completely unexpected happens, or there are so many moving parts and integration points that you just can't "see" it all at once, and a race condition pops up in an extreme edge case.

When Derek hard codes in his mobile number as a test and pushes it to production ... Derek is told he fucked up

Yeah it's not a bug when someone forgets a "where" clause and rewrites the email address of everyone in the database.

That's definitely, DEFINITELY, a fuckup.