Shit Mallet
To release gas from one's rectum (fart) in front of an automated sliding door like those found at entrances and exits of grocery stores, so that when the door opens and a breeze rushes in, on-comers will be hit directly in the olfactory system (nose - sense of smell) by one's 'stink'.
Jay farted in front of the doors at the Soccer Centre last night and when Joyce walked out through the doors, his 'stink' hit me like a 'shit mallet'.