Idiom used to imply someone who is Dead and whose body is fertilizing plants (sunflowers). Hence you are "pushing" sunflowers up from the ground.

Popularly, the idiom was Pushing Daisies. This variation was inspired by a brave Ukrainian woman who encouraged Russian soldiers to fertilize sunflowers, during the Russian invasion of Ukraine in 2022.

Pushing Daisies was the idiom. Now it shall forever be Pushing Sunflowers.
Invade Ukraine, and you'll be Pushing Sunflowers soon.
by bora_am February 27, 2022
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