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2.
When someone says this it's a reference to an individual so stupid, annoying, etc that it should not be existing and is better off being killed before it reproduces (before it lays eggs = before it makes more of itself/ has youngsters as annoying/stupid as itself)
Guy 1: KARGJATA

Guy 2: Kill it before it lays eggs
by NIS May 08, 2013
5 1
 
1.
A common response to something so horrible, annoying, disgusting, and/or crazy that it needs to be killed before it makes more of itself, hence "lays eggs."
*watches "E.T. (Cover) Katy Perry..." on YouTube*
KILL IT BEFORE IT LAYS EGGS!
by DameonDice April 15, 2012
33 1