Put this clip right after the statement it is agreeing with, late in a reaction chain rather than at the open. Build the chain with a huh ceeday moment first for confusion, then this reply, then close with a damn meme button if the agreement turns into disbelief.
About this sound
This is a 0.6 second voice clip of French comedian Jean-Marie Bigard delivering a flat, drawn-out ouais, the casual French yeah. It lands as dry agreement rather than excitement, amused and a little resigned, like confirming something obvious without making a big deal of it in conversation or a reaction.