I felt sure when I saw this t-shirt from Cão Azul that it would turn out to be some sort of idiomatic expression but as far as I can tell, it’s not. “Fazes-me tanta falta como o dedo mindinho” just seems to be something they decided would be a cool slogan. Interesting vocabulary though
Fazes-me tanta falta como… = I miss you like
Dedo mindinho = little toe or little finger. You can specify “dedo mindinho do pé” if you like, but I guess they thought it wasn’t necessary with the picture.
I have already done a post about the names of fingers a little while ago but it’s not vocabulary I use very often so I’d forgotten all about it, and I see I used a different word – “Dedo Mínimo” at the time. I checked in priberam though, and either will do. Neither is brazilian or anything, it’s just like we use “little finger” and “pinkie finger”.
Incidentally, if you don’t already know this, walking around with a portuguese t-shirt on is a great way of announcing to everyone around you that you speak portuguese. That’s nice if you like boasting, but it’s even better if you want portuguese speakers you happen to meet out in the real world to say “Oh! Do you speak portuguese?” whereupon you can clutch at their elbow and not let them go until you have wrung half an hour of conversation practice out of them. For more terrible ideas like this, have a look at the portuguese language hacks page.
Anyway, the point is, I recommend Cão Azul as the internet’s most useful language learning resource.