"Shmeadly" is the inflected form of "Smead". This is the form used by sophomores in ACHS and the Biology teacher. It means, oddly enough, the exact opposite of Smead.
The mischievous and giddy smirk (smile) one possesses after blasting a fierce, but silent, ass cloud of fart. Happy and riddled with the pleasure of knowing their shit crystals will soon latch onto the fines hairs inside their victims noses.
Larry stood patiently amongst his peers, gazing around with a Shmelly Shmirk waiting for the sour faces of whom just inhaled his ass air freshly squeaked from his turd cutter.