A fork of Rural Dictionary
A term used to describe a man's penis that has difficulties reaching an erection. Or another name for a small penis.
I hate my Little Einstien! He had a Little Einstien...so I walked out.
When you cum on a girls upper lip while she is sleeping and then stick white cat/dog hair in it so she wakes up with a mustache and solves the "theory of relativity"
I thought she was just Italian, then I realized someone gave her an einstiens mustache after the frat party last night