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1.
To high five yourself by tagging your hand with the other.
Man I just pulled that gorgeous chick over there! Self high five!
by Lloyd June 17, 2006
 
2.
to touch your index fingers and thumbs together to make a diamond shape with those fingers. Then keep the rest of your fingers straight out.

Started by Former WCW wrestler Diamond Dallas Page or DDP for short.
DDP did the Self high five after winning a match against an opponent from NWO.
by Someguys April 10, 2010
 
3.
To Masturbate.
"Man, i didn't pull that hot chick, so i had to give myself the Self High Five last night"
by DiamondDallasPagefan September 13, 2009