Befriending the natives

Earlier in the evening, I proudly announced to monshu that I now know "Shut up and suck my dick!" in Irish. This immediately got me wondering what other languages I knew how to say this in. German, Spanish, no problem. For Catalan and French, I wasn't sure of the second verb. Xuclar is "suck" in Catalan, but it took a Google search to confirm that "Xucla-me-la!" was probably idiomatic. He suggested sucer for French, which honestly wasn't in my vocabulary before. For Italian, I only know "Give me a blow job!" which lacks a certain forcefulness (and can't easily double as an insult). I vaguely remember learning how to say this in Chinese as well before our trip (hey, you never know what will come in handy), but of course I've completely forgotten it now. And, sadly, my Welsh study has never included a primer on such useful vocabulary and--excellent though it may be in general--this is one phrase not covered by my new Geiriadur yr Academi.