Thunno 2 N, 11 bytes
ɦık+Ḋkg×ばつJn|
I'll add an ATO link when Thunno 2 gets added to ATO.
Add a trailing £ if you want it flagless.
No questionable constants version coming soon.
Explanation
ɦık+Ḋkg×ばつJn| # Full program
ɦ # Push 100
ı # Map over [1..100]:
k+ # Push [3, 5]
Ḋ # Divisible by [3, 5] (vectorises)
kg # Push ["Fizz", "Buzz"]
×ばつ # Multiply element-wise
J # Join by nothing
n| # Logical OR with the number
# N flag joins by newlines
# Implicit output
The Thonnu
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