WordReference Random House Learner's Dictionary of American English © 2015
smart al•eck (or al•ec )/ˈsmɑrt ˈælɪk/USA pronunciationn. [countable][Informal.]
an annoying and obnoxious person who believes he or she is smarter than others.
smart--al•eck•y, smart--al•eck, adj.: the child's smart-alecky answers.

Collins Concise English Dictionary © HarperCollins Publishers::

smart aleck /ˈælɪk/ n ( pl smart alecks)
  1. informal an irritatingly oversmart person
Etymology: 19th Century: from Aleck, Alec, short for Alexander

ˈsmart-ˌaleck, ˈsmart-ˌalecky adj

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