Definition of chiggers:
(n) :
A harvest mite (Trombiculidae spp.), a very small, red mite endemic to the Midwestern and Southeastern US, the infestation of which causes intense itching.
(n) :
A chigoe (Tunga penetrans), a kind of flea found in tropical climates.
(n) :
(US, slang, derogatory, offensive, ethnic slur) An East Asian person who behaves in ways similar to a stereotypical urban African American.