Top definition
A phrase used when you find something very funny.

or

Said after someone says roflcopter. Because the Lmaotank shoots down roflcopters. It is often followed by a claim of victory.

Look, that unicorn just slapped a beaver!
LMAOTANK!!!

or

-That joke was hilarious! Roflcopter!
-LMAOTANK!!! I win!
by Mr. Wing January 26, 2009
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