An trip or excursion that would have normally been fun, but is ruined/made sad by another event; ie: funeral, shooting, fatal accident, etc...
Josiah: I have to go to California next week... It's a sadventure.
Abram: Why?
Josiah: because I have to go to my Aunt's funeral instead of getting some tasty waves.
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A sad adventure or an adventure undertaken by a sad person or sad people.
"I thought we'd have a good time but it turned out to be a sadventure."
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