Crossword clues for riffing
Wiktionary
riffing
vb. (present participle of riff English)
Usage examples of "riffing".
Bing Crosby and the Andrews Sisters riffing to "Is You Is Or Is You Ain't My Baby.
And don't go riffing out NE-440 forms on FT&T personnel: a waste of time as they're not under your jurisdiction.