adverb, adverb taking the 'to' particle
guffawing; roaring with laughter; laughing heartily
Mimetic word for loud, hearty, often uncontrollable laughter. Often used with 笑う or 笑い.
Everyone roared with laughter at his joke.
I'm laughing out loud while watching TV.
He was watching TV, laughing his head off.
The story was so funny that everyone was rolling around laughing.
Loud laughter could be heard coming from the next room.