A person who is an example of something.
Though Jerry was reckless, he somehow always prevailed due to dumb luck. When they say "Fortune favours the foolish", Jerry was the poster child.
po Zetastic Мај 31, 2005
Someone who is the perfect fit for a stereotype.
That girl who says "like, omg" all the time is the poster child for a Valley Girl.
po Im Caca for Cocoa Puffs Јануар 22, 2008
A verb derived from the phrase poster child. To make an example of someone or something through the application of an unfair double standard.
I'm not the only person who has gained 20 pounds. Stop poster-childing me!
po David SB Јун 3, 2008