look up any word, like lesbiauntie:
 
1.
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

Words related to Act your age, not your shoe size

adult age child childish immature infantile