Define Hairy Ass Gorilla Meaning

Hairy Ass Gorilla
My grandmother, who weighs 652 pounds, is 8' 4" tall, drives a Mac truck, and runs the 40 in 10.2. From the movie Dazed and Confused.

You: Wow look at that monster. Who is that?
Me: That's my grandmother, she's a hairy ass gorilla.
You: Wow.
Me: Yep, weighs 852 pounds, is 8' 4" tall, drives a Mac truck, runs a 40 in 10.2, and eats small children for lunch.
By Glyn