Peyton Manning: Smashman App Created By Ex-Teammate ... Inspired By Super Bowl Meltdown

What's bad for Peyton Manning is good for one of his former teammates -- because TMZ Sports has learned an ex-Colts player has created a new iPhone app inspired by Peyton's disastrous Super Bowl performance ... and it's already blowin' up.

Brandon King -- a DB who played with Manning in 2010 -- has developed a smart phone game called "Smashman" ... where a QB (who bears a striking resemblance to Peyton) gets chased around by a defense (that bears a striking resemblance to the Seahawks).

King tells TMZ Sports he came up with the idea after watching the Super Bowl -- saying, "It was the most embarrassing game I ever saw him play. I was like let me make an app where it’s almost impossible to score on a defense."

The gameplay is similar to the smash hit smart phone game "Flappy Bird" -- where players repeatedly tap the screen to move the main character upward to avoid obstacles (or enemies).

King says the object of the game is to score 44 points -- one more than the Seahawks scored on the Broncos in the S.B. -- but the ex-NFL player tells us it's nearly impossible.

"No one has gotten to 44 so far, it’s pretty hard."

King says business has been great so far -- with more than 2,000 downloads in the first week of its release.