Here's Johnny Manziel shrugging off his latest football drama ... and showing off his cannon arm!!!!
The ex-NFL quarterback -- who was just cut by the Montreal Alouettes and the entire Canadian Football League last week -- hit the field for some drills ... and showed he's still got it.
Manziel was out with his longtime trainer, George Whitfield, in San Diego on Monday ... throwing passes and working on his footwork.
You can see in the clip, Johnny slings a 20-yard dime OVER a soccer goalpost for a would-be TD.