I mean the physical gesture of slapping hands together. Any difference between them? Thanks.
Give me five means slapping palms above each other's heads as a a greeting, celebration gesture, or sign of joy. Sometimes one can also say Give me a five, Give me (some) skin!, Skin me!, Slip me five!, Slip me some skin!, and High five! with the same meaning.
Give me five!: Sl. Slap my hand! (as a greeting or to show joy)
The word 'five' in the "give me five" expression refers to your hand's 5 digits -so saying 'give me a five' digits is incorrect. BTW, “give me a five” generally refers to a five dollar bill.
"Give Me Five" is not referring to High Fives. to give five is a reciprocating action where on person horizontally holds out their hand (palms up) to receive another persons friendly hand slap then returning "five" back to their friend. Again... THIS IS A TWO PART ACTION.