bum trundler

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 meet Woman Z
Man X: You sir, are a total and complete bum trundler.