A 32-year-old woman in Pennsylvania is facing assault charges after she showed up at her ex-boyfriend's place last Sunday night . . . and punched him in the junk so hard, it basically…exploded.

This happened in Pennsylvania. She went to her ex-boyfriend's house last Sunday night, but he wasn't home.  So she waited….and waited…and finally when he showed up after 1 A.M., she was inside his house.

He told her to leave. But on her way out, she landed a punch directly in the family jewels . . . she punched him so hard that one of his jewels FELL OUT.

An ambulance took him to the hospital, and I haven’t seen any updates.

She's facing a lot of charges.