blophus

A Blophus is the result of farting while seated in a narrow, confining chair. Such as airline seats.
This forces the gas forward, past the genitals rather than past the cheeks of the ass. It is shocking to one who experiences it for the first time, and those seated nearby.

Greg was both concerned and delighted by his first blophus, however, the other officers seated in the stake-out van were horrified.