I’m shaking

I'm shaking (in fear)

A sarcastic phrase used to emphasize that one is not actually scared of someone or something. That scrawny twerp wants to fight me? Ooh, I'm shaking!
See also: shake
Farlex Dictionary of Idioms.

I’m shaking

verb
See I’m shaking in fear
See also: shake
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • I’m shaking in fear
  • I'm shaking (in fear)
  • I'm there
  • I’m there!
  • I'm not mad at it
  • be shaking in (one's) shoes
  • be shaking in (one's) boots
  • I ain't mad at it
  • be quaking in your boots
  • quake