Definition of "mare's fart" in English

Noun

1. A nickname for a type of flower. (Can we verify this sense?) Ragwort (Jacobaea vulgaris). (Can we verify this sense?) A nickname for any of several other types of flowers, including the fleabane and dandelion.

2. (Can we verify this sense?) Ragwort (Jacobaea vulgaris).

3. (Can we verify this sense?) A nickname for any of several other types of flowers, including the fleabane and dandelion.

4. Something of no value, importance, or consequence whatsoever; a thing utterly not cared about.

   • See also: give a damn, give a tinker's damn, give a rat's arse, give a fig