Same as always in these cases:
Prove you have a reasonable use for it that is non infringing, if you can. I have no idea what your alleged friend thinks a "mtvdesi" is, but if it's something completely unrelated to MTV the music television cable channel and company (or otherwise not infringing upon the field that trademark is used in), then you should be OK. If "Desi" is the name of a VJ or something and your, um, friend got it to try to put up a site about him/her, then including "MTV" in it was a really bad idea. Or if "Desi" related to the MTV company in some other way and it was registered knowing that, you're best bet is just to give it up.