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An expulsion of gas from the anus whilst moving or walking which makes a noise reminiscent of laughter.
"Larry let loose a mighty bumchuckle, much to the chagrin of the woman walking up the stairs behind him."
by Grm September 29, 2007
When, during anal sex, the giver (or receiver) laughs, giving a surprise sensation to the non giggler.
man: "have you ever had a bumchuckle?
woman: "no? what is that?"
man: "here, i'll show you, HAHAHAHA"
woman: *screams*
by Naurog February 17, 2009
a bubbly sounding farty.
gross! did you hear him just bumchuckle in public!
by SpindleShanks May 29, 2006