what in sam hill 

What in the world...?

What in sam hill are you talking about?

what in sam hill by giselle gardonyi July 20, 2004

What in (the) Sam hill 

What the hell...
(An elaboration of what. Sam Hill is a euphemism for hell. Often with the force of an exclamation. See examples for variations.)

What in (the) Sam Hill is going on around here?

What in (the) Sam Hill do you think you are doing?

What in (the) Sam hill by AmSh August 19, 2012