To laugh until you barf. (verb)
Vomit from laughing too hard. (noun)
Our first date didn't go so well. The waiter accidentally spilled red wine on her white dress, and to make matters worse, I couldn't stop laughing until I larfed all over the table.
My first job interview didn't go so well either. The interviewer told a witty joke to break the ice, and I couldn't keep from larfing on his desk.
Why did you two break up?
Well, she began to tickle me while we were in bed, and you know how ticklish I am, so I couldn't keep myself from... well, let's just say that a little bit of my larf went in her mouth.