A slasher is a basketball player who primarily drives (slashes) to the basket when on offense.
A slasher is a fast and athletic player who attempts to get close to the basket for a layup, dunk or teardrop shot.
Slashers usually take more free-throw shots than other players due to the increased amount of contact made on them as they constantly and aggressively run towards the basket.
Many different kinds of slashers gain extra free-throws by "drawing fouls", which is deliberately causing contact with a defending player.
[1] Many players who begin as slashers typically develop their game (especially their jump shot), as age and injuries occur, which may prevent them from being as effective as a slasher (for example, Michael Jordan and Kobe Bryant both developed a fadeaway jump shot as they got older).