1 definition by 447 Grove St.
Similar to a girl queefing, a guelph is when the penis of a man releases air out of the meatus of the urethra, making a soft "fart-like" sound.
Dude, so I was sleeping with this chick, and after 3 minutes, I guelphed. I was so embarrassed I had to stop.
by 447 Grove St. December 2, 2013