unfashionably late

Derived from fashionably late.
To be unfashionably late is to have missed, and gone over the time period (between 5-15 minutes) where you are fashionably late. While being fashionably late is recognized by the host(s), being unfashionably late makes you seem rude.

"Tom was unfashionably late for my party, what a dick"

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Unfashionably late

Showing up to an event when it's already over.

Bobby was so unfashionably late, he showed up to watch some football and the game was already over and everyone else had left.