There are many Hebrew tattoos that simply say "Hi".
No, this isn't done on purpose, what the poor idiots wanted was the word "Chai", meaning life, or alive. It's a very common thing to put on a tattoo, and a VERY common thing for a tatooist to misspell:
Oh well, at least this one is pretty:
Now the next image is how a "Chai" is actually supposed to look. See how the "Chet", the letter on the right is all connected? When you leave a gap, you get a completely different letter "He".
Of course, if those girls just went for a piece of Chai Jewelry instead of a tattoo, mistakes and permanency would not have been an issue.