你他妈的a rude way of saying you or yourself, him or himself, me or myself, etc.
Get your ass in my office now! 你他妈的马上到我办公室来！
I ought to sue his ass for slander.
I was dragging my ass in to work every day in order to feed my family.
If Mona would get her ass out here to Texas, I'd be happy to meet her.
See also: ass (BOTTOM)