A shot of the cheap version of liquor, the "house" liquor. Given when a patron asks just for a shot of tequila/vodka/rum/etc without expecting a certain label. When a certain label name is requested, it is referred to as a
call shot.
Same applies to drinks. "
Rum and coke" vs. "
Bacardi and coke."
Just get a well shot. It's
cheaper than the
name brand stuff.