He heaved up with a sulfurous curse, braced his legs and glared about him, with a burst of coarse guffaws in his ears and the reek of unwashed bodies in his nostrils.
To guffaw means to laugh loudly. As they guffawed loudly, the ticket collector arrived `Ha, ha,' everyone guffawed. `It's one of Viv's shock tactics.'. to laugh loudly (From the sound)