Top Definition
Stop behaving immaturely. Said to adults who are acting like overgrown children and to school-age children who are acting like overgrown toddlers.
It's time for you to get serious and stop being silly. Grow up, pal! Act your age, not your shoe size!
by meow2u3 February 23, 2008
6 Words related to Act your age, not your shoe size

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