Translation:Mijn zoon kan achterstevoren praten.
netarp nerovrtsrethca nak nooz njim
my reasoning being that surely she knows he can because she can talk backwards too ;)
I think it is very easy: You turn your back to the listener :)
Achterstevoren or achteruit? Am I right in thinking that achterstevoren is closer to back-to-front whereas achteruit involves physical movement backwards?