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1.
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?
by DRTina May 07, 2009
 
2.
just a word used when someone is confused. same idea as 'what the heck...'
What in the Sam Hill are you doing?
by Swarsfanatic May 11, 2005
 
3.
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...
by Ajix Black May 26, 2006
 
4.
A beast Downhill racer that races for specialized bicycle company
woody: damn Sam hill is fast!
by dh/fr biker 671 May 06, 2009