"Woops boom" is a declaration of
pity to be used after something, like a
pen or a child, takes a large
fall. Often employed by mothers and babysitters. It is similar to oopsie.
Max fell off the
slide.
Mom: Woops boom! Come here Maxie, I
will give you a popsicle to make it
better.
Gabi: Ah! I dropped my calculator and the batteries fell out!
Megan: Woops boom!