oofta is the correct spelling of the word too often misspelled as uff-da or oofda(although others would disagree). It is an expression used to convey surprise, exhaustion, or a bunch of other feelings a Norwegian may have.

An exclaimation reacting to something aweful, surprising or tiring

The modern version of oof. Also a tool to make lumboc go insane.

the expression that of exhausted, or frustrated individual says