I heard this on a Mexican TV show: "Mi hermana es bien fregona."
But it can't literally mean mop ...so anyone?
I'm depending on Google here - there are hits like
"Eres bien fregona con el Photoshop" on a Mexican site.
For example, you don't want to say the word "cabron" to a Salvadoran...I think to a Spaniard this would be a huge insult too. You'd get half killed for it, if you're lucky.
Say it to a Mexican, they think you're being cute. It's like saying "bloke" to the British.