Rhino + Homo = RHOMO. A gay man dating a younger man who is at least 10 years his junior. Usually more common among men who were formerly straight.
Synonym: Pink Panther
Alvin: Hey Marcus, guess what?
Alvin: Did I tell you my dad and mom just got divorced?
Alvin: Did I also tell you he's come out of the closet?
Marcus: No way!!!
Alvin: He's dating someone 30 years younger than him too.
Marcus: DUDE!! HE'S A RHOMO!!!