へそが茶を沸かす
1
what a joke!;don't make me laugh!
See also:
へそで茶を沸かす (へそでちゃをわかす)
2
to split one's sides laughing;to be convulsed with laughter;one's navel boils water (using the heat generated by laughing)
Other forms
臍が茶を沸かす 【へそがちゃをわかす】 · へそが茶をわかす 【へそがちゃをわかす】 (search-only kanji form) · 臍が茶をわかす 【へそがちゃをわかす】 (search-only kanji form)