The Brief: Spoopy is an internet slang term for "spooky."

Bluesquiggle
DEEP DIVE

Something that is spoopy is both funny and spooky. It references the fun and cute side of Halloween festivities.This intentional misspelling or mispronunciation of spooky is typically used in October and may be accompanied by skeleton memes.

Spoopy from r/Unexpected

2 spoopy 4 me from r/hearthstone