Etymology
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smoothie (n.)

1928, "suave person, person of complete self-assurance and poise, especially in the company of the opposite sex," college slang, from smooth (adj.) + -ie. As a type of blender drink, by 1983.

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Definitions of smoothie

smoothie (n.)
someone with an assured and ingratiating manner;
Synonyms: smoothy / sweet talker / charmer
smoothie (n.)
a thick smooth drink consisting of fresh fruit pureed with ice cream or yoghurt or milk;
From wordnet.princeton.edu