sierratitius 

when you are around a person who is mentally unstable and potenially dangerous who is named Sierra.

I would stay away from her, she has sierratitius

sierratitius by XxgAmErgiRL155xX November 2, 2020

sierraititus 

A syndrome when you happen to be around someone who is classified by the FDA as mentally unstable person named sierra

Guys be careful, I heard she has sierraititus

sierraititus by XxgAmErgiRL155xX November 2, 2020