A shlaverage is a penis of average/normal length, not too big not too small. The length of it can be measured between 4 and 7 inches but this can vary depending on your culture. Usually used when the correct length is not known but the word can roughly describe the length.
I was talking to my friend Billy Bob at the time when i was feeling a bit scalverage while i was noticing that his beard was a tad bit longer than usual; I was feeling scalverage.
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).