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1.
To stare off in another direction from the party you are interacting with, preferably to a third party, with a blank or mildly surprised look on your face to emphasize the ridiculousness of your conversation and/or situation with the first party.
The bridesmaid was so drunk and loud during the toast that I had to throw a Halpert to guests at another table.

After the professor stated the due date for the assignment, the undergrad asked when the assignment was due. The professor promptly threw a Halpert to the rest of the class.
by l0lwhut November 15, 2010