RIFF
riff
(noun) a jazz ostinato; usually provides a background for a solo improvisation
Riff, Riffian
(noun) a Berber living in northern Morocco
riff
(verb) play riffs
Source: WordNet® 3.1
Etymology 1
Noun
riff (plural riffs)
A repeated instrumental melody line in a song.
A clever or witty remark.
A variation on something.
A spoof.
Verb
riff (third-person singular simple present riffs, present participle riffing, simple past and past participle riffed)
To improvise in the performance or practice of an art, especially by expanding on or making novel use of traditional themes.
To riffle.
Etymology 2
Noun
riff (plural riffs)
(anatomy, archaic) The belly; the bowels.
Proper noun
RIFF
(computing) Acronym of Resource Interchange File Format.
Source: Wiktionary