I think I said "my bad" in a post here mebbe 5 days ago.
So no, rpm is not the only grown male in the world to use the expression "my bad".
Don't be frontin' biotch - you say it too:
Henry: "We've got a leak on 13."
Lazs: "Why, that is not possible. I triple-checked it this morning. Multiple times. Three times. There is no leak. The water flows free, but it is contained via an intricate system of pipelines. Like blood through veins - with much purpose. Like wind through trees, and song through the opening in the center of an acoustic guitar."
Henry: "What is wrong with you today?"
Lazs: "My bad. Just drive."