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Christian Combs isn’t taking 50 Cent‘s recent online digs lying down … he’s hitting back at the “senior citizen” by bringing up his baby mama!

Here’s the deal … 50 Cent shared a clip of Christian trying to get a “Bad Boy” chant started at a recent concert — which went over like a lead balloon and made for a hilariously awkward moment.

50 captioned the post, “Damn 👀his timing was just a little off. 😳” … which got fans cackling online. Christian, however, wasn’t snickering — he was crafting his own roast online.

Combs responded in the comments, “The real reason why this senior citizen Curtis is angry and keeps posting me is cuz his BM 😂.”

While Christian didn’t provide any clarity on the comment, it seems to be a reference to Daphne Joy … the mother of 50’s 13-year-old son Sire, who dated Diddy in recent years.

Basically, Combs went at 50’s personal life — though the rapper quickly brushed it off — and flamed the new Diddy documentary Christian and his brother Justin Combs posted about.

As you know … 50 regularly posted about Diddy during his federal sex trafficking trial — which ended with his rival getting a guilty verdict on 2 of the 5 charges against him. He was sentenced to 50 months in prison.

We reached out to 50’s rep … so far no word back.