C2 noun /ˈspuːnərɪzəm/
spoonerism
Spoonerismus
Meaning
A verbal error in which the initial sounds of words are swapped to create a humorous effect.
Example
He made a spoonerism by saying 'queer old dean' instead of 'dear old queen'.
Er machte einen Spoonerismus, als er 'seltsamer alter Dekan' anstelle von 'lieber alter König' sagte.