Back in my day.. it seemed like our grandfathers, dads, uncles, and older brothers, had an endless array of ingenious terminology for going number two. Here's the top ten I've heard over the years that particularly stand out the most in my mind ..
Evacuating the premises
Laying a brick
Paying the band
Brown bear exiting his cave
Dropping your guts
Spray painting the porcelain
Releasing the hounds
Releasing a sewer snake
Dropping the kids off at the pool
Growing a tail
And this is just a short list! There's many more (some of which I can't repeat here). Perhaps I'll post some more subdued phrases here at some point.