The idiomatic expression "plenty of sugar" means to be very kind, friendly or generous towards someone. It is often used in a humorous way to describe someone who is being overly sweet or insincere in their actions.
Sentences with «plenty of sugar»
The yarn is too irresistible: We're fed plenty of sugar in this authorized fairy tale, but are left hungry for beef. (metacritic.com)
There's certainly nothing wrong with fruit (and my recipe contains some) but most of us are already getting plenty of sugar, even from natural sources like sugar and fruit. (wellnessmama.com)