Expressions (phrases, clauses, etc.)
what a joke!; don't make me laugh!
Idiomatic expressionsee へそで茶を沸かす
Expressions (phrases, clauses, etc.), Godan verb with 'su' ending
to split one's sides laughing; to be convulsed with laughter; one's navel boils water (using the heat generated by laughing)
Idiomatic expression
Also written 臍が茶を沸かす【へそがちゃをわかす】