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1.
Killing daisies refers to having to take a piss while in the backyard at a house party. You're at a house party, in the backyard and the seal needs to be broken. You see the line for the bathroom is long so you find the closest unoccupied space of wall and break the seal.

"Dood! What are you doing?"
"No worries bro, just killing daisies."
by j mingo May 04, 2007