Top definition
When a senior citizen reads all of the signs outloud to the driver of the vehicle.
Leads to a condition in the driver known as Billboardom.
I was driving mother to the doctor's and she insists on reading every sign and billboard to me.
I think she suffers from Signility.
by SJ@24 July 11, 2009
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The vengeful act of crapping on a lover's chest while they sleep.

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