When a vagina is gaping so widely one can fit a trundle bed within it and house multiple inhabitants.
When Amanda and Gregg discussed the sex life of their friend, jessica, they said "her vag is such a trundle fuck, of course she can fit her husbands dick and her part time lovers in at the same exact time!!"
1) The noise that occurs when a fat person trundles including the booming of large feet and the screams of people as they are trundled over.
2) A fat person's fart.
3) Any non-voluntary noise associated with a fat person.