So my fellow windows programmer I work with, is an immigrant from Cuba, only been in the U.S. for about 10 years. He is a really good programmer btw...

Sometimes I need to provide context to things I say in Slack:

Now we are COOKING WITH GAS!!!

That's a VERY old U.S. marketing term (1930s / 40s) that is used by some people in the U.S. to denote "finally, it's working"
English Colloquialisms

And by "some people" I of course mean really old senior citizens...

"Okay Boomer"