What in Sam Hill?

What in (the) Sam Hill?

Inf. What has happened?; What? (An elaboration of what. Sam Hill is a euphemism for hell. Often with the force of an exclamation. See examples for variations.) What in Sam Hill is going on around here? What in the Sam Hill do you think you are doing?
See also: SAM, what

What in Sam Hill?

verb
See also: SAM, what