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1.
The small uncircumsized penis on a person. Namely one of Spanish or Latin decent. But can be used for any male typically a Mexican that is not legal.
Hey Janet how was last night with Francisco?

Ennhhh not soo good the guy has a beaner weiner.

Ohh sorry at least he looks good in a cowboy hat and oversized belt buckle
by Jahn mccool February 27, 2010
 
2.
An effect felt after consuming mdma tablets (ecstasy). One becomes sexually aroused but cannot achieve an erection.
Swim: Last night I had these two ho's butt ass naked in my bed!
Swim's Friend: So you had an epic threesome right?
Swim: Nope... got beaner weiner. I was rolling too hard. It ended there :(
by rollingballs July 02, 2013