A "masher" is someone, usually a man, who acts in a disrespectful or pushy manner towards women, trying to get their attention or affection. Full definition
IMPORTANT STEP: Take potato out of the oven, using potato masher mash potato tops just like you see in the picture above. (munchkintime.com)
The game is FULL of quick time events, they practically populate the boss fights, most of them being button mashers with unfair expectancy to complete. (metacritic.com)