The pineapple has 'fizzy' taste

[shinyshoes]

and it's 2 days overdate.

Will it still be OK to eat

Would you?

Its those prepacked ones from Tesco. I have 3 packs of the damn things?

Personally I wouldn't eat it as clearly gone off- in my experience those pre packs often make fruit go off quicker than they should so avoid and stick to fresh or tinned

Think that means it's 'off'!

Fizzy = off. Don't do it!

nope. its off. would bin it
(and i find those ready prepared fruits seem to go fizzy and off, often before the date, id much rather cut up an unadulterated pineapple, even just a few slices and keep the rest in the fridge for another day)

Personally I would eat it, if it was palatable. I know what you mean by the fizzy taste, it's beginning to ferment but it is still safe.