Bengals Star -- DUMP ETIQUETTE ... Don't Crap Until AFTER the Maid Leaves

Here's a tip Emily Post would approve of ... when nature calls, consider the help ... at least, that's the Brown Code that Bengals safety George Iloka lives by.

The 23-year-old defensive stud just faced that exact situation in his home ... tweeting:

"I gotta take a big ol s**t but my cleanin lady still here. And she super nice so I dont even wanna do her like that by tearin up the bathroom."

Way to do her a solid, man.