(adjective) When a girl dresses herself in a way that makes her look simultaneously trashy and nasty. Usually including platform flip-flops, too much black eyeliner, bleach-blonde hair with dark roots, wearing pajamas in public places, and so on.
Dayumm, that bitch is trashnasty!
Getting so drunk you are literally trash and very nasty
" I got a bottle of vodka when gonna trashnasty"