This is one of the Japanese proverbs explaining the things and situations are very funny or ridiculous. It is said that this is because your belly looks like teakettle is boiling when you laugh so hard.
It is similar to the English proverb, ‘laugh until one’s sides split.’. Although this Japanese proverb is often used when the things are ridiculous more than funny.
There is a famous scientific fact that laughter is good for the immune system. Laughter decreases stress hormones and increases immune cells so that NK (natural killer) cells which fight against cancer cells and viruses gets stimulated.
Why don’t you stay at home and watch your favourite comedy shows accompanying with a cup of green tea on this Friday night?
Then you can expect `Heso ga cha wo wakasu’ situation for your healthier life!