Top definition
A girl or woman, whether in media or one's personal life, that was the subject of a man's sexual fantasies during his formative years, usually from just before puberty to the end of puberty. Derived from proto, meaning primitive, and boner, meaning erection.
by tuusmater March 18, 2018
2
A potential boner. Not quite a semi, but far more than a softie. Should be considered a compliment when wielded by men who wear lab coats for a living.
by ompelle December 15, 2008