A person who isn't perticularly good at video games, so they just mash random buttons on the controler, hoping that they do something right. A tactic that works best in fighting games.
My friend is such a buttonmasher. I wish he'd play the game right for once.
ussually a sick prank. when one is dared by another employee to cover themselves in mashed potatoes and runnaked past there fat potato hungry co worker
timmy dared jimmy to run pasted diane coverd in mashed potatoes knowing he would get a very uncomfortable mashed potato ride