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1.
The watery like discharge from a squirtable Ketchup bottle that has not been previously used.

"oh man, i squeezed SPERL all over my hamburger!!"
by Renée R July 06, 2006
 
2.
To shoot an innocent child by mistake. Named for Tony Sperl, a police officer who shat and killed an 8n year old kid in California who was holding a squirt gun.
Oh shit, I did a Sperl last night. Took me an hour to get the brain matter cleaned off my shoes
by Lew Stuhl September 06, 2008