1. n a fast act of sex; a quickie; a quick one. I think we’ve got time for a fast one!
2. n. a fast or quickly performed activity, such as eating or drinking something. Here’s a tavern. You got time for a fast one?
3. n. a clever and devious trick. (see also
pull a fast one.)
That was a fast one. I didn’t know you were so devious.