You found it. It's the sound of a cat
being run over by a LAWN mower.
The Big Bang Theory Season 2, Episode 15
...we had an inflatable Santa Claus
with plastic reindeer on the front LAWN.
The Big Bang Theory Season 3, Episode 11
WOMAN [ON RECORDING]:
Get a thicker, fuller LAWN
in less than six weeks.
Breaking Bad Season 2, Episode 10
If I mow the LAWN, can I have my allowance?
The Big Bang Theory Season 8, Episode 1
Why, because they won't get off your LAWN?
The Big Bang Theory Season 8, Episode 4