American Heritage Dictionary
(5)
Century Dictionary
GNU Webster's 1913
(2)
WordNet
(2)
Elsewhere on the web
A burp is a simple function designed to expel excess air from the stomach, air which we swallow while eating, drinking carbonated beverages or smoking, among other ways.— ABC News: ABCNews
Apple is still experimenting with new policies - for months it didn't allow any 'burp' or 'fart' apps, which have grown to become thankfully we've only used real booty … (oops I said it again) in the demo though.— Original Signal - Transmitting Web 2.0
Normal people get a stomachache after swallowing air and trying to burp, so we think it's pretty easy to see what these guys are going through.— Cracked: All Posts

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a year.
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