Cam Newton: Butchers 'Nice & Slow' ... For the Kids!

Here's Cam Newton doing a TERRIBLE rendition of Usher's "Nice and Slow" on a radio show Thursday morning ... but the good news -- it was all to help raise money for a good cause!!!

The Panthers QB appeared on Power 98 in Charlotte this morning for the "Maddhouse Sing-A-Long" with Ms. Jessica ... where Cam agreed to channel his inner Usher.

Spoiler Alert -- he's no Usher.

In fact, he had to CHEAT and read the lyrics off his notes!!!

Still, gotta respect the guy ... he was there to push his big celebrity kickball tournament in N.C. Friday -- which raises money for the Cam Newton foundation.