An insult and compliment (combined into one) used to describe your retarded crackhead of a best friend who will do dumb shit with you all the time. You will meet them in your Pre-AP English class during your freshman year in high school. After about a year you will drop them because they attempted to kill your boyfriend. They may also accidentally send you a short video on Snapchat of their non-existent titties. Exposing them for their pure stupidity and bitchiness is HIGHLY recommended.
"Belle, you're a fucking ancient ass iguanana."
"Oh, yeah, I exposed an ancient ass iguanana the other day."