Jessie James Decker is firing back at internet trolls ... calling them super lame for body shaming her ripped kids -- and her former NFL star hubby, Eric Decker, is cosigning on her message.
Jessie initially received the hate on her social media page on Saturday -- after she posted a photo of her three children looking shredded on a Mexico beach.
While celebs like Julian Edelman, Golden Tate and Kelly Rowland loved it -- other hecklers threw insults Jessie's way, accusing her and Eric of overtraining their kids .