Two players were playing a chess game. One play voiced "it looks ominous" after playing a move that he thought was brilliant. The other player responded "riffing".
What does the verb, to riff, or the adjective, riffing, mean in this context ?
Was it used more similar to "gloating", "babbling" or something else ? Or was it a typo ?
Merriam-Webster only has the following two definitions for the verb to riff, and neither seems fitting in this context.
1.to perform, deliver, or make use of a riff
2.to riffle, skim