To indicate a fart that unexpectedly deviates into a poo.
Taken from cricketing terminology, referencing a delivery which unpredictably bounces higher than expected at the last minute, often striking the batsmen in the ribs or head.
Often requires the decommissioning and disposal of underwear after the event. Originated on a Nation Express coach, Junction 34 - Lancaster.
mate, i'm in a mess! That fart got big on me