Because I'm super cool and not in any way an embarrassing dad, me and my 5 yr old do a cool handshake. I'm sure it's from something (I thought fresh Prince but I can't find footage if it!)
Best description I can do is palm slap left, back hand right, tickle fingers then thumb backwards (that bit is fresh Prince)
It must be from bill and Ted or something but can't find it!
Ring any bells with anyone!?
He's joined MS13
Friends?
21 Jump Street?
We need a video
Any of these close.??
The Sweary Northerners? After a reyht good…………..
SECTION!!??
Haha, the bill and Ted collection is good. Still can't find it. I definitely didn't just make it up, I'm not imaginative enough! Maybe someone did it to me when I was little or something.

Friends?
I think this might actually be the answer.
Edit: nope that's just finger wiggling no slaps.
Yep, it's slaps, then friends style finger wiggle plus fresh Prince bit as well. I guess I'm just a cultural sponge 🤣
I favour the octopus over winger wiggling
Big Hero 6?
definitely didn’t just make it up, I’m not imaginative enough!
I know exactly the handshake you mean. I can't remember where it's from either. Which is really annoying me now, so I hope we come up with an answer. My first instinct was it was from a police film - a partnership thing - maybe Lethal Weapon, Bad Boys, something like that?
Wherever it came from, you’re probably not allowed to appropriate it 😉
School of Rock?
Edit - no that’s not it
Bloods and Crips?