Old Dude Boyfriend: the name given to men who are unwittingly dating high school girls. Typically men in their late 20s and early 30s who can't see through excuses like "you can't come over, my roommate is a sociopath/nympho/klepto" or "I spend so much time with my mother because I just really value family ties!"
"Hi, I'm Anna, and this is my Old Dude Boyfriend Kent!"
"I had to tell my ODB that I couldn't hang out with him tonight because my goldfish had a heart attack. I'm starting to run out of fake pets."