wet dream
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In general, images with someone having or implied to have a lewd dream.
Sometimes it's as straightforward as the dream itself being depicted in a thought bubble, but not always. Another sign of a wet dream is a so-called "nocturnal emission" (ejaculating while sleeping for those with a penis, female ejaculation or general vaginal wetness while sleeping for those with a vagina), which may result in stained sheets.
