Foreskin Fart

When an uncut man retracts his foreskin and as it passes over the head of the penis is makes a wet fart-like noise. Sometimes it can be very brief, other times "farts" can last up to 15 seconds or more; it all depends on the tightness of the foreskin; a tighter foreskin causes a shorter fart, the amount of precum already on the penis head, and the force with which the foreskin is retracted.

taking foreskin like a balloon, blowing into it, like a balloon, holding it tightly and then sqeezing the air out.