To let one go when suffering from serious windy-pops. A polite way of admitting your bodies emission, without using foul language.
It is not neccessary to wear a hat to be able to
exclaim that you have
dropped it.
Can also used by a third person as an
accusative
"I must
apologise to you all, I dropped my hat as the doors closed."
Or
"Did you
drop your hat again?" said Roy
"No", said Dave, through the smoke rising from his
smouldering trousers.