This is a descriptor for when something has reached it maximum level of adorability. So if something is as adorable as possible it has the quality of "ashley-kate-butler".
This word functions best as an adjective with a qualifier like "completely", "so" or is best negated by "lacking".
Wow, that baby kitten is completely ashley-kate-butler
Last week my niece ate a baby-motherfucking-cino with her pinky finger raised. It was ashley-kate-butler.
That girl thinks she's hot... but she's lacking any ashleigh-kate-butler.
It's a boy who is: nice, sweet, loving ,caring and an embarrassing boy. They might have brown/black hair and is normally cute. Whoever has an Ashleigh boy in their life is very lucky