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