Abbrivation for Joint Direct Attack Munition. A GPS guided free fall bombs, GBU-31.

or
Can be use to refer toward Jack Daniel's whiskey.

JDAMs are used for surgical strikes. One JDAM (bomb) per target in a populated city or one JDAM (shot) per chic in a crowded club has a sucess rate of 90%.
USAF used JDAMs to surgically hit Yugoslavian cities.

I bought a bottle of JDAM for $15.
by JDAM December 10, 2010
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A series of GPS guided free fall bombs that have accuracy of roughly 5-10 meters. Can be used in all weather. From Joint Direct Attack Munition.
The JDAM has been used extensively recently.
by Colin Ritter August 6, 2003
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