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1.
Trash Tags are commonly called Hickies ( Love Bites) on neck, bust, anywhere, indicitive of slutty tendancies. they may also have tramp stamps. Usually given to White trash or any other promiscuous Females. White trash is an American English pejorative term referring to white people in the United States, suggesting a lower social class
by Skank-4 -All December 26, 2010
 
2.
When a person on social media (twitter/instagram/facebook) posts a ratchet picture/status, someone might comment "#trashtag" to alert them that their post needs to be taken to the trash.
*girl posts picture of her dry humping a lamp post while intoxicated*
Follower: you're an embarassment to the human race #trashtag
by Plain bellied sneech April 04, 2014