1. n. someone who does business in a big way. (The abbreviation is an initialism.) If you’re such a BTO, why are we standing here in the rain?
2. n. a man who chases women. That twit thinks he’s a big-time operator. A stud he’s not. A big-time operator needs a big-time car!
n. a clever and quiet person, especially in reference to romantic involvement; a seducer. He thinks he’s such a smooth operator! Clare is an old smoothie till she thinks she’s got everything the way she wants. Then you see the real Clare.