The common internet source for this information is the Bulge Report, which describes him as having the "biggest dick ever, walks around locker room and his dick swings":bulging103 said:Supposedly he is very well hung
http://www.bulgereport.com/malecelebreportpreview.htm
(he's 13th down in the far-right column).
However, this is in fact merely a verbatim quotation of a single posting that was made on the PopBitch boards in 2005 --- see the related discussion in this listing of "The Top Ten Worst Guys (That We'd Fuck Anyway)" [Rocker is no.3]:
http://www.nightcharm.com/?p=259
For my money, there's so much crotch-protecting paraphernalia in most images of him, that it's hard to reach any conclusion from these:
http://espn-i.starwave.com/media/mlb/2001/1002/photo/a_rocker_i.jpg
http://i26.photobucket.com/albums/c127/gamini05/rocker.jpg
http://ompi.onemodelplace.com/OMP_Images/Photographer/7202/7202_p_1644DC79-2B3D-897A-24F94C238C982AA2.jpg
http://chronicle.augusta.com/images/headlines/090898/BRAVES_METS.jpg