Read the following context and answer the 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 .
Question: What might Ian mean when he calls something a " bottom burp . "
Answer:


It is something that is or sounds like flatulence .