Ahhh, but it is a word. . .
Merriam Webster dictionary entry for "trashy"
trashy adj \ˈtra-shē\
trash•i•ertrash•i•est
Definition of TRASHY
1: being, resembling, or containing trash : of inferior quality
2: indecent
— trash•i•ly \-shə-lē\ adverb
— trash•i•ness noun
Examples of TRASHY
Her outfit was a bit trashy.
<I know that sequined shirt cost a lot of money, but I still think it looks kind of trashy.>
First Known Use of TRASHY
circa 1620
Related to TRASHY
Synonyms: cheesy, dowdy, inelegant, styleless, tasteless, ticky-tacky (also ticky-tack), 1tacky, unfashionable, unstylish
Antonyms: chic, classic, classy, elegant, exquisite, fashionable, fine, posh, ritzy, smart, sophisticated, stylish, tasteful
Related Words: graceless, inappropriate, incorrect, unbecoming, unseemly, unsuitable, wrong; outmoded, out-of-date, passé; coarse, crude, unrefined, vulgar; cheap, common, inferior, junky, lousy, low-grade, second-rate, shoddy, sleazy, tawdry; flashy, garish, gaudy, glitzy, grotesque, kitsch, kitschy, loud, ostentatious, overdone, showy, splashy
Near Antonyms: appropriate, becoming, correct, fitting, proper, right, seemly, suitable; conservative, genteel, handsome, neat, quiet, refined, restrained, simple, understated; contemporary, modern, up-to-date; à la mode (also a la mode), happening, in, modish, swank (or swanky)