catch me

Short for "you'd never catch me doing that" or similar.

catch me

1. (colloquial) There is not the remotest possibility of one carrying out the deed or action suggested.
   • 1862, George Borrow, Wild Wales: Its People, Language and Scenery:

     I wished at first to persuade him to give me lessons in the office, but could not succeed: “No, no, lad;” said he, “catch me going in there: I would just as soon venture into a nest of porcupines.”