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means real frikkin big. started by irish street poet terry wogan.
a Giamungous good mornin to you all
by j'cob October 15, 2004
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2
A combining of Giant and Humungous. Bigger than big. For use when a normal word just doesn't quite cover it.
The Grand Canyon is giamungous.

The porn actress' breast were giamungous which gave me a giamungous erection.
by Moji JoMama August 23, 2003
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