Vomit from laughing too hard. (noun)
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.