So, having seen "mojito" online a few times, I'm here to tell you that, no, while it's similar, what you were drinking last Friday was a caipirinha, made with lime and Pitu Cachaca.
Take 1 lime.
Slice and quarter it.
Put it in a glass.
Add two teaspoons of granulated sugar.
Muddle it (mush it up good).
Add 2 ounces of cachaca.
This guy here does a good job of demonstrating: