Top definition
An individual who monitors and publicies the non approved (as deemed by him/herself) behaviors of others. We all know a person who thinks they are perfect in every respect. This same person is very vocal about everyone's actions when out for a night on the town. This person generally does not contribute to the the good time.
If they choose not to drink alcohol, this is the person that hangs with the group all night, taking notes and come morning, takes pride in reporting anything embarrassing that any member of the group does. Frequently stating everyone has a drinking problem or is a loser.

"It would have been a great night if we didn't let the sinspotter in the limo."
by Funguy Shrooms November 16, 2009
Get the mug
Get a Sinspotter mug for your father Trump.