WEENER is the miss-spelt version of the actual term, 'WIENER'.
Wiener itself originates in the wiener dog, which is long, and has short legs. Additionally, 'wiener' is also a type of German sausage. Both have humorous similarities with the male genitalia.
In slang terms, 'wiener' is a euphemism for the penis.
Weaning is a thing as is weaner and weaned. but no weener.
'man that guy has a massive wiener' (weener)
the correct spelling of the phrase "foo-foo valve". Reference to the noise when one lets an accidental pass gas "pfoof/pfft", and more obscure but relevant reference to the slang australian (and new zealand) term for a gay man "poof"- as indirectly referring to the anus.
he nearly blew his pfoofer valve