What is the meaning of riff off? - Question about English (UK)

The Riff-Off! A singing game for middle school (great for subs!)

The New Pitch Perfect 2 Clip Shows An Ultimate Riff-Off Round

What to Draw/doodle (My Ideas ʕ´•ᴥ•`ʔ)

Here's the winning bride from the Talamore Bridal Expo who will be receiving a FREE hair and makeup trial!! Thanks for attending the show and

Pitch Perfect - The Riff-Off

Leverage app marketing w/ ChatGPT [50+ prompts]

Aziz Ansari quote: I always have my setlist planned out, but the best

In Pitch Perfect (2013) Ester Dean's character sings S&M in the riff-off. Dean actually wrote this song which was then given to Rihanna for her album Loud (2010). : r/MovieDetails

Cavin Eggleston at LA Comedy Club, A set I did for the World Series of Comedy in February. I hope you enjoy! I say some swears. My bad.

Riff & Jenni Play: Rusty Lake Roots! (Ep. 01) - Off-Topic Discussion - The Interactive Fiction Community Forum