Top definition
Instrument used to measure the shit pressure in the atmosphere. Used to anticipate a shit storm and potential influx of shit hawks; whom may either spread their shit or swoop down and take humans away to the shit nest.
"Do you know what a shit barometer is bubs?" "It measures the shit pressure in the atmosphere" "Your ears will implode from the shit pressure"
by Stall101 October 29, 2009
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