I don't know why, but the phrase "no great shakes" has been silently obsessing me for the past few days and I figured if I just wrote it out, it might go away.
If you don't know, it's an idiom that refers to something ordinary or mediocre. One source has it attributed to Lord Byron, of all people, but I don't know if that's true.
Sounds more like gangster-talk from a 1930s movie to me.