Oooh. Here we go...

My most hated at the moment is turning a noun into a verb, usually heard on TV cookery shows (a la Jamie 'I'm a Pukka Geezer' Oliver'):

'then fridge it for an hour'.

NO! NO NO NO. You can refrigerate something for an hour, or you can put it IN the fridge for an hour. You can even chill it, if you want a one-syllabled option. But you CANNOT 'fridge' something. Grr.

I've also heard 'Oven it', which sent my blood pressure through the roof within seconds.

Think I should get out more...
:-)