Top Definition
1: a little know element resembling scandium, but with more impact to baseball ratio per square inch.

2: Discovered by Dirk Jacobine in the late 1900's, jacobonium is used in baseball bats, golf clubs, and stripper poles around the world.

3: can be used as an adverb, commonly abbreviated as "jacked"
1: "Alex, can you grab me some more jacobonium, i need to make this bat longer and lighter then any other bat in senior league history"

2: Fan1: "He just jacked that one outta here" Fan2: "No, it's too high" Fan1: "Too high?"...
by SnoozeDog November 24, 2010

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