Definition 1: An audible release of air derived from pockets of air caught between two individuals during intercourse. The sound is most commonly derived from the stomach or chest area and during a very heated and sweaty session. The sound is similar to a flatulence.
Definition 2: This sounds may also be derived from the sucking noise of two bodies separating during intercourse.
ex. 2. Betty was getting sixty-nined by Bob. As Betty wriggled in ecstasy they began tirp veraciously.
ex. 3. Wanna tirp? (Invite to intercourse)
ex. 4. Diane tirped Dale.
ex. 5. They starting tirpiing. (Euphemism)