What you want to do is extremely childish. In a perfect world our community members would be mature, but I suppose this is not a perfect world.
That being said, there are TONS of sites on the net that will let you send bulk SMS messages. I found them searching for software that would let me SMS from my PC so I wouldn't have to use my phone.
Now, since you are childish, you may not know how to use Google and that's why you are asking here. But if for some freak reason you are both an immature grown person AND smart, I suggest you search google, you will find what you need instantly.