all she wanna do is pop a perc and get her

The phrase you provided is informal and colloquial, often found in casual conversation or song lyrics. It means: "All she wants to do is take a Percocet (a prescription pain medication) and get her [high or relaxed]." If you want a clearer or more formal version: "All she wants to do is take a Percocet and feel its effects." Let me know if you want a full sentence rewrite or explanation!