Based on the context and the answer, generate a question. 

Context: Then , the grand finale rumble ( or bottom burp , as Ian refers to it ) , went echoing first through my chamber , then , seconds later , through hers . I put my hand to my mouth in a dramatic gesture of embarrassment . Isla did the same . I giggled .

Answer:

It is something that is or sounds like flatulence .



What might Ian mean when he calls something a " bottom burp . "