“We all busted out laughing.”

English Lesson: We all busted out laughing.

You're telling a story about a funny mistake that your friend made. You've just described the mistake, so now you describe your reaction.

We all busted out laughing.

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(someone) busted out laughing

The phrase "bust out laughing" describes someone suddenly laughing really hard. You "bust out laughing" when something funny and unexpected happens. 

This is a casual and slangy spoken English phrase. The more correct expression is "burst out laughing":

They all burst out laughing at the sight of Emmett in his gorilla costume.

Use "burst out laughing" in more formal and written English.