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A P'way hand shake is when you show off three fingers to tell a girl you want to give her a special shake. You bend your third finger back with your thumb, then stick your middle and index finger together with your little finger sticking out like a sore thumb.
@joe23: Just showed my middle finger to Lisa and said, 'You look like a P'way hand shake.'
DM: 'Hey, I've got three fingers up. Wanna go all the way?'
At the mall, he did the P'way hand shake to my sister and said, 'You're my type.'