In most cases refering to the female to be a massive slut and or cunt. Signs of a skagzilla include but are not limited to being a bitch, multiple STD's, C-section scars from those always fantasic one night stands, has given or gotten a clevland steamer, or if you are "that guy/girl"

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life