Wikipedia
Signifyin' (sometime written "signifyin(g)") (vernacular), is a form of wordplay. It is a practice in African-American culture involving a verbal strategy of indirection that exploits the gap between the denotative and figurative meanings of words. A simple example would be insulting someone to show affection. Other names for signifyin' include: "Dropping lugs, joaning, sounding, capping, snapping, dissing, busting, bagging, janking, ranking, woofing, putting on, or cracking."
Signifyin' directs attention to the connotative, context-bound significance of words, which is accessible only to those who share the cultural values of a given speech community. The expression comes from stories about the Signifying Monkey, a trickster figure said to have originated during slavery in the United States.
The American literary critic Henry Louis Gates Jr. wrote in The Signifying Monkey (1988) that signifyin' is "a trope, in which are subsumed several other rhetorical tropes, including metaphor, metonymy, synecdoche, and irony (the master tropes), and also hyperbole, litotes, and metalepsis. To this list we could easily add aporia, chiasmus, and catachresis, all of which are used in the ritual of Signifyin(g)."
Signifyin' is an album by jazz saxophonist Lou Donaldson recorded for the Argo label in 1963 and performed by Donaldson with Roy Montrell, Tommy Turrentine, Big John Patton, and Ben Dixon.