哈哈

Adjective

 * 1)  the sound of someone laughing out loud

Adverb

 * 1)  the sound of someone laughing out loud

Usage notes

 * In Internet slang, it is often written with the initialism, i.e. a series of h’s in Mainland China or a series of ㄏ in Taiwan, like hhhh or ㄏㄏㄏㄏ.

Noun

 * 1)  bra; brassiere