Definitions for p's and q's
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Random House Webster's College Dictionary
p's and q's(n.pl.)
mind or watch one's p's and q's, to pay careful attention to one's own behavior or affairs; be cautious or discreet.
Category: Idiom
Origin of p's and q's:
1770–80; perh. from some children's difficulty in distinguishing the two letters
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"p's and q's." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/p's and q's>.

