Come on, yu pie-eatin' doodle-bug; I'll beat yu to th' gate!
It would be just as good as 'doodle-bug,' and more—more accurate.
type of beetle or larvae, c.1866, Southern U.S. dialect; see doodle + bug (n.). The same word was applied 1944 in R.A.F. slang to German V-model flying bombs.
[all senses connected with doodlebug, ''the larva of the tiger-beetle or various other insects'']