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Sam Hill built the roads that connected Eastern Washington to the Coast in the early 1900's. His estate, now an art museum located in Maryhill, WA (named after his daughter). Many thought he was crazy for thinking the roads could be engineered and completed. The use of his name when planning a task or acting in a way that is considered crazy or impossible.
What in the Sam Hill do you think you are doing?
Sam Hill by DRTina May 7, 2009
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just a word used when someone is confused. same idea as 'what the heck...'
What in the Sam Hill are you doing?
Sam Hill by Swarsfanatic July 17, 2006
v. Another word for hell. Or can also be used as a curse word.
1. What in the Sam Hill is wrong with my computer?!
2. What in the Sam Hill do you think you're doing?
3. Holy Sam Hill...
sam hill by Ajix Black July 17, 2006
A beast Downhill racer that races for specialized bicycle company
woody: damn Sam hill is fast!
Sam Hill by dh/fr biker 671 May 6, 2009
Sam Hill is a woman beater, a nonce and a waste of sperm all added together. What type of sperm was his father producing because it must've been fucking mutated. Sam Hill is not fit for this planet hence why they refer him to Hell. F*** you Sam Hill!
Woman: Sam Hill has been beating me again, look.
Man: Grab the pliers, we'll go castrate the bitch.
Woman: Yee.

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

what in sam hill 

What in the world...?
What in sam hill are you talking about?
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