Top definition
The act of raising your hand as to give a high five but instead a grenade or any other explosive is thrown. Hanoi coined from the vietnamese, who had a fondness for doing this in the Vietnam War.
Used in Tropic Thunder.
A: We're being backed into a corner! We're surrounded!
B: It's time to hanoi high five these fuckers.
by Lensty October 10, 2009
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