Its actually the skin on your elbow.

no, it's not weenie/penis, it's weenis. your elbow!

The excess skin on your elbo

Lot's of opinions that it's the skin on your elbow--when I was a kid 30 years ago, however, it quite clearly was used as a combo-word in between "Wussy and Penis."

So if you weren't quite a Wussy (Weiner/Pussy), and you were kind of acting like a dick, you were a Weenis/Weenus.

a combination of weiner and penis, it's someone who is not not quite being a dick but acting a little more lame than being a weiner.

my definition is a weenie/penis...you aren't quite grown but u aint a young kid. its like the premature age

An unusually small penis.