look up any word, like dirty sanchez:

1 definition by Dan Houseman

A boo boo is usually assosiated with someone who makes a large mistake, and who then usually gets humiliated by other people. Or you can yourself be called a boo boo, if you constantly make mistakes.
"Hey trevor you just made a large boo boo".

"You are the biggest boo boo ever".
by Dan Houseman April 16, 2008