Pull a Marcy

Pulling a Marcy (pulled a marcy, pull a marcy) refers to "Marcy Wu" from the TV show "Amphibia"
Spoilers! It has multiple meanings:
1. Getting stabbed

2. Having a "it was me all along" reveal moment
3. Almost dying

4. Getting possessed

Person 1 .Do you think Luz is going to be possessed?

Person 2. Yeah! She's going to Pull a Marcy on us!