When she hits him, he goes flying. Not just across the room or even across the yard — across town. Sometimes he reaches Low Earth Orbit — or at least vanishes in A Twinkle in the Sky.
This is usually an adaption of a one-panel gag the animators end up having fun with, although the usual treatment is to make it so over the top that it's not mistaken for real violence.
Compare Armor-Piercing Slap, [...] [tvtropes.org]