Balls Deep In Your Mom
It refers to when your deep inside someone's mother exactly what the word implies your sexually deep throating someone's mom mostly use this as a comeback or you are legitimately putting balls deep in their mom.
Chris: What are you doing
Tyron: I'm Balls Deep In Your Mom
Chris: N****a
Tyron: I'm Balls Deep In Your Mom
Chris: N****a
Deep in the mom
Action of putting your dick in the vagina of the person who gave you birth.
Deep in the mom, i'm playing mario 64 on my gamecube.