Haha yes! I think we all reach a point in our lives when we truly become adults, and it's when we realise that adults who didn't understand our lingo and were embarrassing actually:
Understood more of it than they let on,
Used it incorrectly around younger people for a laugh, or to help bolster the kid's confidence (the kid gets a little "omg that adult doesn't know what blorpitybloo means! I'm so much more cultured than they are" boost).
Realised that every generation has their language "thing", and we don't necessarily have to keep up with the latest word on the street to be fulfilled, or to connect meaningfully with the younger generations.
I guess I just think it's a way to "tease" someone without the target of the joke being them. Like, lets all laugh about what an idiot dad is, instead of lets all laugh about what an idiot this kid is.
When I was a kid uncles, siblings, and yeah parents, "teased" us by making mildly humiliating comments about which we would all laugh in a good natured hearty way. As in "fine_sandy_bottom is too short, we'll have to put sheep poo in his boots to help him grow quicker". Maybe it's just teasing, maybe it's a shitty thing to say to a child.
Playing "dad is an embarrassing idiot" doesn't have that ambiguity.
Haha yeah that stuff is great :-) Bonding at its finest!
Not quite the same thing but reminds me of how my father would always tell me I have hollow legs, on account of the huge amounts I'd eat whilst remaining skinny. I mean, I'd have a proper big evening dinner, then a bit later a microwave lasagne, then another microwave meal, and maybe a bar or two of fruit and nut chocolate, and never put any fat on xD