What one says when they are either bored, discouraged or just wish to be incredably random.
Best said when stretching early in the morning when everyone else sleeping, at the top of your lungs, or when people are least expecting it.
Shawn suddenly screamed "HMMBLAH!!!" and scared the shit outta me. The hallway was silent for about 5 minutes.
by Percivlle & Millicent December 06, 2003

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