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