NFL Coach Jimmy Johnson -- I Just Bought My Own PRIVATE JET!!!

Football and boner pills have been very VERY good to Jimmy Johnson ... 'cause the NFL icon says he just bought his own PRIVATE JET!!!!

The "NFL on FOX" star -- who's also a spokesman for Extenze -- just posted a photo online saying, "made new purchase ... no more TSA check ins for me!"

So far, no word on the exact model of the plane -- or how much he paid for it -- but it's a jet ... so, congrats Jimmy ... you're a frickin' BALLER.