"Dance Moms" head honcho Abby Lee Miller is offering up health advice to 7-year-old reality star Honey Boo Boo ... telling TMZ, Boo Boo needs to be down with the fitness if she wants to win pageants.
Miller was at the Abbey in West Hollywood when she admitted she wasn't happy with her own weight issues -- but moments later started ripping HBB ... saying she "needs to get in shape. She needs to be at a dance studio. She needs to be training. She needs to work on her turnout."
If you've seen Abby's show, you know she doesn't pull punches -- even with kids -- but we gotta ask ...