The former Bolton boss said it is disgraceful that successive defeats should undermine his position at St James' Park.
Less than 48 hours before the derby clash with Sunderland, a furious Allardyce said: "Am I angry about the speculation? I am hardly happy about it, am I?
"The speculative rubbish stirs the s*** up to make your life difficult. I understand that. It is probably more volatile and more unacceptable than I expected here.
"You don't speculate about someone taking over someone else's job when you lose two games on the trot. It goes with the territory, unfortunately."
He called for increased patience from Newcastle supporters and warned them not to expect instant success.
"I still think it will take three to five years to get this club to where I want it to be. I will get that time if I win football matches. That is the bottom line - keep winning and you keep getting there.
"Over the last three to four years this club has not done much anyway. It is not as if I am starting from getting the club into a position where it was before or used to be when I first started. It is about progress.
"Some fans want it to be instant but it cannot be. Instant is not sustainable. Instant goes to bankruptcy in business.
"You have instant success in business then nine times out of 10 that business goes bankrupt. You make instant success in football, nine times out of 10 you fail.
"I have waved the magic wand before but I'm not so sure I can wave the magic wand as quickly as they would like here."