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1.
A cheap, showy, gambling, unscrupulous shyster of the old American West.
That tinhorn cheated at craps! After him, boys!
by ScottX March 25, 2008
 
2.
Only in central and northern Oklahoma, the word tinhorn sometimes refers to a culvert.
Be sure to replace that old tinhorn when you repave the driveway.
by argyle_zombie May 28, 2009
 
3.
low quality or not desireable; see bunk
I'm outta duckets!
Man, that's tinhorn.
by i, robot July 17, 2004