1. be wreathed in smiles – csupa mosoly
   to be smiling and looking extremely happy
   I’d expect you to be wreathed in smiles but, instead, you seem rather cast down. 
2. be rolling in the aisles (informal) – fetrengeni a nevetéstől
   to laugh without being able stop
   The comedian had the audience rolling in the aisles. 
3. grin/smile from ear to ear – fülig ér a szája
   to look extremely happy
   “We’ve had fantastic news!” she said, grinning from ear to ear. 
4. gales of laughter – harsogó nevetés
   a lot of loud laughter
   I could hear gales of laughter coming from downstairs. 
5. to have sb in stitches (informal)– hasát fogni a nevetéstől/vonaglani a nevetéstől
   If a joke or funny story has you in stitches, it makes you laugh a lot.
   My jokes had them all in stitches.

to chuckle – kuncogni/vihogni
I was chuckling as I read his e-mail.

to giggle – vihogni/kacarászni
The boys were giggling at the back of the classroom.

to snigger – vihogni
They sniggered at what the teacher was wearing.

to snicker (US) – nyihogni/vihogni
Please, stop snickering at that rude joke and get back to your classwork.

to crack up (informal) – elröhögni magát
I just cracked up when I saw her in that dress.

to burst out laughing – nevetésben törni ki
The boss fell over the chair and everybody in the room burst out laughing.

to chortle with glee – vidáman kuncogni
We chortled with glee at the funny news.