Tyrion Lannister: Casterly Rock is an impregnable fortress. But as a good friend of mine once said, “Give me 10 good men and I’ll impregnate the b*tch.”

From Game of Thrones – Season 7 Episode 3: ‘The Queen’s Justice’ (7×03)

“Give me 10 good men…” – Tyrion’s Quote Meaning

Tyrion is using his colorful language to say he can conquer Casterly Rock. Even though it is considered an impregnable fortress he knows a way and can get in with using just 10 good men.