What does "blondie" mean?

A nickname for a person with blond hair, particularly an attractive woman.

Blondie

Common synonyms include: band blondie, bar cookie, brown sugar bar, cookie bar, fair-haired person, golden-haired person.

/ˈblɑndi/ noun, slang

noun, slang ·Moderate ·College level

Noun

1
A nickname for a person with blond hair, particularly an attractive woman. endearing, informal
"“I'll give you five,” said the drunken man. “Come along.” He grabbed her arm, waved his other hand at Etta. “So long, blondie. 'Nother time. Good luck.”"
2
A sweet, chewy, generally vanilla-flavoured and chocolate-free baked good: a blond-colored brownie.

"He named his guinea pigs Blondie, Thumper, and Candy."

From blond + -ie.