The internet is a strange place filled with an endless number of weird and wonderful phrases. One such phrase is "trash anime," a weird, almost contradictory phrase, indicating that an anime is terrible yet carrying a meaning similar to guilty pleasures. Over the last few years, there has been a pick up in its usage, as well as variations such as "anime trash" and "trashy anime." Surprisingly, rather than carrying a negative connotation, a large portion of the online community uses it to convey meaning similar to guilty pleasures.
Source：https://www.cbr.com/why-guilty-pleasure-trash-anime-become-fan-favorites/
