Yep, that headline is a direct reference to Michael Irvin's junk.
We were talking with the Playmaker about celebrity underwear endorsers (yeah, it was a weird convo) ... when we brought up guys like Justin Bieber, who's a spokesperson for Calvin Klein undies.
That's when Irvin told us point-blank he couldn't rock the same drawers as JB because of ... well ... junk size.
"Those are small guys. I may not be able to fit in their underwear ... if you know what I mean."
Bold statement considering the whole "Bieber's Got a Huge Penis" revelation of 2015 (remember that?).
Point is ... don't judge a book by its whiteness.