Simultaneous laughter and burping. Often experienced while drinking a carbonated beverage and watching a funny movie. The muscle spasms of laughing provoke a burp; the sound of which then joins the laughter to create berfter.
They drank a ton of soda and put on "Superbad", and man, you could hear their berfter for miles.
by Phatts McDangle October 11, 2010