What is Builder's Bum?
1.
When someone in loose trousers bends forwards and the arse crack rises above for all the world to see.
Common with builders, council workers, plumers and general overweight people.
"My plumber was fixing my pipes and his swetty builder's bum kepted staring me in the face."
See
2.
When a
If she bends down any further she'll flash her builder's bum
See