-The act of farting on your hand and then shaking someone's hand
-The act of wiping your recently-shat-on ass with your hand and then shaking someone's hand
The act of wiping your ass with your hand (preferably while very sweaty or having recently shat), proceeding to shake another's hand.
stink palmed, stink palming
Came into common usage from the film Mall Rats.
If you really hate someone, give 'em the stink palm.
1) Spot someone you have little or no respect for at a social gathering.
2) Sneakily put your hand down the back of your own pants, and have a good rummage, exposing it to (how can I put this..?) ass-sweat.
3) Boldly run up to your target, extending the 'infected' hand for him/her to shake.
4) They are left with a stinky hand and complete ignorance of the insult they have been exposed to. You are left with an equally stinky hand, but also a sense of pride/victory.
Aka Shaolin Stinkpalm