"Doug Whaley can eat a d**k. Doug Whaley can die in a hole and drink bleach. I’m dead serious."
Ex-NFL running back Karlos Williams is opening fire on ex-Bills GM Doug Whaley ... going OFF on the guy for how things went down during his time in Buffalo.
Remember, Williams had an INSANE breakout rookie season in 2015 -- scoring 7 TDs in just 11 games -- but never played another down in the league due to substance abuse suspensions.
Now, the 27-year-old is looking to make a comeback via the Canadian Football League's Toronto Argonauts .