I'm guessing this means something like "used to going out

I’m guessing this means something like “used to going out drinking.” I can’t even think of how we say this in English.

What about “I am used to the pace”?

Hahahaaha! Yes, “marcha” is slang for “partying”, “going out”, … There are a lot of words to say that, some more “trendy” than others at a given time: juerga, farra, parranda, …