bumchuckle

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."

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Bumchuckle

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*

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bumchuckle

a bubbly sounding farty.

gross! did you hear him just bumchuckle in public!