Haha Funni
You say 'haha funny' in real life to show you're being fake and also very tired of whatever nonsense just happened.
He told me a joke and I said 'haha funny' and then I took a nap.
She said something weird and I said 'haha funny' and then I left the room.
He talked for 10 minutes and I said 'haha funny' and then I cried.