One minute their dark silver 2010 Acura RDX was sitting in their Mississauga driveway looking relatively clean, the next it was covered with a huge splatter of brownish, smelly matter.

“It’s definitely poop’’ which fell from the sky Wednesday, says George Sullivan, an engineer who has worked with planes and believes the substance probably came from one. It’s the third such incident in the GTA in a week.

Sullivan and his wife, Liz Murray, had parked their car minutes earlier and Sullivan was about to get into the family’s swimming pool with his 3½ -year-old granddaughter when he realized he had to turn on the water heater. That meant walking by the driveway and that’s when he saw the splatter all over the car. His daughter’s parked car was also hit.

Sullivan is convinced nothing feathered is responsible.

“There’s no way birds could poo that fast, in that short an area, with that sort of splatter. I can guarantee this is not from a bird or 5,000 birds.’’

Sullivan, 51, has contacted Transport Canada and emailed them photos of the splatter. He says he was advised by the federal agency to scrape off a sample for investigators before he washes his car.

Sullivan considers this a “serious matter’’ because if this is human waste that fell from a plane, it probably started in a frozen state.

“It might not melt in time — it could have hit my granddaughter,’’ he said.

Sullivan said he’s heard about the incident involving the Giannakos-Gilfillan family in Mississauga who say smelly brown matter that appeared to be human waste fell into their backyard on June 19. Transport Canada is also investigating that case.

“Obviously there’s an airplane that has a problem,’’ said Sullivan, adding he’s worked on planes as an engineer. “This needs to get fixed.’’

Transport Canada is investigating yet another June 19 incident.

Gary McCourt was driving his GO bus on Highway 407, near Dufferin St., when a deluge of brown matter fell on the road right in front of the bus, a large portion of it splashing back up on his windshield.

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“I couldn’t believe it. I thought this can’t be birds — it looks like someone dropped a huge bucket of stuff,’’ said McCourt who quickly turned on his wipers.

Transport Canada noted in its investigation report that the splatter was “the width of one lane of highway.’’

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