Well, Reyn. When my husband and I were first married, I became angry because he spent too much time participating in after hours gigs. I called him a philanderer, thinking that it meant one who parties too much.
He glowered at me saying, "Do you know what you just called me?"
I immediately ran for my dictionary and found two definitions. The second one said: a wooly opossum of South American. I pointed it out to him saying: That's what I meant.
(hmmm. no update on this one)