The one dick pony is a female that is still having sex with or has only had sex with, the person they lost their virginity too.
Bro, she has been with him, and only him, for 9 yrs, since she lost her virginity to him at 17 yrs old, that makes her 26 yr old one dick pony.
by DevientGenie May 27, 2016
Get the One Dick Ponymug.