rhymes with gappa or gappe(hindi)...jab log gappe marte hein, this is when there is boisterous laughter all around ....I know its a way too dumb....
Remember Disney's character GOOFY & his laugh.
When u do some GUFFLA you have a boisterous laugh
Remember Gabbar Singh or guffar sing in SHOLAY & the way he laughed
when bramhi says "bloody guffaw ga"...its hilarious
when u GOOF up some thing, others are bound to guffaw about it
remember gufa in hindi.. and imagine ALI BABA laughing after seeing huge gold..If you laugh a bit in gufa, it sounds like boisterous laugh.