What is a bam tree?

Answer 1

A Bam tree is a tree that when it falls over goes "BAM" when it hits your house or vehicle.

Aspen trees in Alberta are often referred to as BAM trees as over time they rot from the inside out. Strong winds can blow breaking them off at any point, and if the trees have leaves on them the wind causes the top of the tree to twist or spin as the wind hits the leaves and the trunk twists at a weak spot and splinters and the upper part falls.