A rough translation (not sure but looks like Schwietzer Deutsch or German as spoken in Switserland): "Mongo's a r s e is open and he gets on my nerves."
If you are going to dis someone, don't hide behind a language he probably doesn't speak. It's cowardly at worst and showing off at best.
Je bent een gigantische lul als je zoiets flikt miniato!
My boss started off as a human being (Engineer) but turned to the dark side and decided to put on the persona that he is still in touch with the technology that he rules.
To make our weekly meetings interesting, we all do a little home work and try to add at least one new buzz word or acronym just to see how he handles it. Surprising enough he does not show a ruffled feather and moves on before there is an awkward pause for his input.
We all love Wally, as he says what we are all thinking during a discussion with our bosses. I have come close to getting in trouble when I accidentally used some of his come backs.