An individual who frequently or unexpectedly neglects his regular companions in the pursuit of sexual gratification.
Derived from the accusation that these individuals seek to "trundle" (push/drive) the opposite sex, rather than partake in regular social activities.
Man X: Do you wish to accompany me and others to our regular meeting place?
Man Y: I cannot right now as i must urgently meetWoman Z
Man X: You sir, are a total and complete bum trundler.
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!!"