Despite having the word 'banter' in its name, someone described as a Bantersauross have no banter whatsoever. In fact, they are usually the brunt of the jokes.
The act in which an erect penis detatches itself and forms arms, teeth, feet, and a tail. It then tends to rampage across cities endlessly. The only cure, find a boner-shrinking image; such as Paris Hilton
Tom: Oh my god, is that set of boobs glowing?! I think im getting a boner!!! OH NO! WATCH OUT!
Someone who thinks of themselves as really cool, and can be used to describe someone who is boasting about their friends/weekend/awesome party. Usually used in a sarcastic form.
"So there were like 3000 people at my party last night and they all love me..."
"Oh, you bantersaurous, you!"