Little Rod Rodney

Someone with a tiny penis that won't satisfy anyone even if he tried. Can be used also to describe someone with a useless weapon/object that won't be of any use. Simply can be used as just useless, unsatisfying or weak.

1) How was sex with Matthew the other night Stacey?
He was a 'Little Rod Rodney'
Oh I'm so sorry for you

2) Is the bronze dagger any good?
Nah man it's a 'Little Rod Rodney'