He has let a brewer’s fart, grains and all; said of one who has bewrayed his breeches.
Piss and fart.
Sound at heart.
Mingere cum bumbis,
Res saluberrima est lumbis.
I dare not trust my a-se with a fart: said by a person troubled with a looseness.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Fantastically Dressed * Fart CatcherNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes