Top Definition
A term coined by Bill Simmons of ESPN in reference to the day when the weather finally becomes warm enough in a notoriously cold part of the country (i.e. the Northeast) that convertible tops can go down and girls can wear miniskirts and halter tops outdoors. Usually occurs in April.
Halter Top Day is the light at the end of winter's long, dark tunnel.
by TheMick23 March 18, 2011

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