belly laugh

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A deep laugh.

from the GNU version of the Collaborative International Dictionary of English.

• noun a vigorous, loud laugh, expressing a strong amusement.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A deep, hearty laugh
• verb To laugh a belly laugh.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a burst of deep loud hearty laughter
• noun a joke that seems extremely funny