Define Usual Suspects Meaning

While they were the usual suspects, they were the easiest targets of the protests.

"She's going to save herself till marriage?"

"Yup."

"But she looks like a pornstar. She always shows off her tits, and flirts, and flaunts it!"

"I know it's like the Usual Suspects ending."

"Fuck. I'd dump her if I were you. Dirty cock tease."