What is YESYESYESYESYES?

when you are very excited about something and just saying yes! doesnt cut it. you show how excited you are by saying "yesyesyesyesyes"

Emma: hey Meg, wanna make cup cakes and then go for a bike ride?

Meg: yeahh i do, yesyesyesyesyes!

YESYESYESYESYES - meme gif