RhymeZone: rapping definitions

Definitions of Rapp:

name: A surname (common: 1 in 20000 families; popularity rank in the U.S.: #2717)

noun: The sound of a rap or knock.
noun: (music) Musical speech accompanied by a rhythm, most commonly as part of hip-hop music.
adjective: (colloquial, dated) Remarkably large; whopping.

(Definitions from Wiktionary)