The female genitalia; vagina; pussy
"I fu*ked her last night and her washer needed a good scrubbing.. lucky i had a rubber on!"
"You can tell her washer would be mint..."
You know how after you smoke weed. like five hours later you're all down and tired... or 'washed'. A washer is a person who acts like they are washed all the time.
You know jake?
Yeah. that fool is such a washer.
Yeah he doesn't ever do shit.