None of you can give a definitive answer - you're waffling along so I feel moved to join-in with my waffle.
Call my bluff:-
1.Hal and Tow - Haul and Pull - to hoist up a May pole or equipment for May Day festivities, or
2.Traditional Tug of war on the Village green (on May Day) for men to display their strength /virility to the gathered young ladies - May Day being the accepted day for beginning of such arousal.

Makes as much sense / credible as some of the shite in this thread .
Thankyou Jon - for Rumbelows sounds about right to me - but could it be a local word referring to a "rumble in the hay" - type of thing.