Etymology
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snoopy (adj.)

1895, from snoop (n.) + -y (2). The cartoon dog of that name in the "Peanuts" newspaper comic strip debuted in 1950.

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Definitions of snoopy
1
snoopy (adj.)
offensively curious or inquisitive;
the snoopy neighbor watched us all day
Synonyms: nosy / nosey / prying
2
Snoopy (n.)
a fictional beagle in a comic strip drawn by Charles Schulz;
From wordnet.princeton.edu