1.when see or hear something weird
2.when you are confused
person: I ain't eatin yo ass no mo
you: da hell
person: boi i wearfgdhjgbgfdghhhv
you: da hell
a sign of annoyance or confusion in reference to somone saying somthing stupid or ignorant.
Da Hell is this fool talkin' about?
when you see somebody doing something thats "sus"
Boi wat da hell i just saw someone call that kid sexy!