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1.
To return a wave to someone you think is waving at you, but is actually waving to the person behind you. Usually results in embarrassment and introversion.
Damn...I thought that girl was waving at me :(

HHAHAHAHA MIS-WAVE!!!!!!
by David Hawaii May 26, 2007
 
2.
To wave to somebody you thought was someone you knew but really you just waved to a complete stranger. That complete stranger gives you a look of dismay not for the wave but for the enthusiasm and excitement you conveyed along with your wave.
Who the heck was that person waving to me like he knew me. It must have been a mis-wave. What a jackass!
by DarrellDW August 28, 2008