Definitions from Wiktionary (holla back)

▸ noun:  (informal) A holler back; a reply.
▸ noun:  (informal) An echo of voices, much like the response of a crowd to a cheerleader.
▸ noun:  (informal, uncountable) Feedback.
▸ verb:  (informal) To reply.
▸ verb:  (slang) To make or respond to romantic or sexual overtures.
▸ verb:  (informal) To contact again at a later time.

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