Horse's fart

n.

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A type of fungi. Not quite a mushroom.

In use

I sent de yungfella out tew pick mushrooms an' all he came back with was a horse's fart!

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Hello there, old sport. Would you like me to translate 'Horse's fart' in use for you?

I sent the young lad out to gather mushrooms, and all he returned with was a puffball!