It's a newsgroup joke referring to the occasional post from
     someone, almost always identifying himself as a straight male,
     who is seeking "hot" (i.e. sexually arousing) bisexual female
     partners to save him from the monotonies of the back rack at his
     local video rental shop.  The term Hot Bi Babe is almost always
     used sarcastically, occasionally by those of us who really are
     hot bi babes, to lampoon those who regard our sexual preferences
     as a spectator sport.  (Our crankiness has more to do with the
     frequency and ineptitude of clueless approaches than it does with
     the acceptability of fantasies or anything like that.)

     (and where can I get some?)

     Posting personal ads to alt.flame is usually a good strategy;
     alt.dev.null is another good bet.  Best of luck, and keep those
     cards and letters.