Paraphonemic

In phonology, a paraphonemic sound is one which does not occur in the general lexicon of a language, but is instead limited to mimesis and similar uses. Examples from English include the dental and lateral clicks, used to express pity and to spur on horses; the glottal stop, found in uh-oh! and uh-uh; and the syllabic fricatives shhh! and zzz...