Be overfull with something, be unable to contain oneself with an emotion. For example, Jane's award made her parents burst with pride, or Harry is bursting with the news about his promotion. [Early 1600s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.