In Sweet Smell of Success (1957), at the bar, press agent Sidney Falco approaches Frank D’Angelo, who is sitting and watching guitarist Steve Dallas perform with the band on stage:
Frank: Joe, give my nephew a drink.
Sidney: Your nephew doesn't want a drink.
Attention then shifts to guitarist Steve Dallas:
Frank: That's a lollipop, that boy. The kid's only great.
What does "That's a lollipop" mean?